Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Narrative (Details)

v3.22.2.2
INVESTMENTS - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2022
USD ($)
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
May 31, 2022
USD ($)
May 31, 2014
USD ($)
Sep. 30, 2022
USD ($)
industry
state
portfolioCompany
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
industry
state
portfolioCompany
Sep. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
Aug. 31, 2012
USD ($)
Summary of Investment Holdings [Line Items]                      
Purchase of investments               $ 102,046 $ 47,550    
Success fee income           $ 1,733 $ 2,650 6,733 4,682    
Principal repayments of investments               48,000 14,060    
Cost           703,218   703,218   $ 669,248 [1]  
Dividend income           $ 4,825 $ 1,590 $ 6,381 $ 1,592    
Number of investment portfolio company | portfolioCompany           26   26      
Number of states which have invested in the company location | state           18   18      
Number of industries that have made investments | industry           15   15      
Investments owned, fair value           $ 737,935   $ 737,935   714,396 [1]  
Uncollectible receivables allowance, minimum required day for uncollectible adjustment               90 days      
Gross receivables from portfolio companies           2,100   $ 2,100   1,700  
Allowance for uncollectible receivables           1,400   1,400   1,300  
Investment Portfolio Benchmark | Customer Concentration Risk | Five Largest Portfolio Investments                      
Summary of Investment Holdings [Line Items]                      
Investments owned, fair value           315,700   $ 315,700      
Concentration risk, percentage               42.80%      
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Common Stock Warrants                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[3],[4]                   0  
Investments owned, fair value [2],[3],[4]                   921  
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Line of Credit                      
Summary of Investment Holdings [Line Items]                      
Cost           2,800 [5],[6]   $ 2,800 [5],[6]   2,800 [2],[3],[7]  
Investments owned, fair value           2,800 [5],[6]   2,800 [5],[6]   2,800 [2],[3],[7]  
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[3],[4]                   4,722  
Investments owned, fair value [2],[3],[4]                   14,746  
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[3],[7]                   14,000  
Investments owned, fair value [2],[3],[7]                   14,000  
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(L) – Common Stock Warrants                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[6],[8],[9]           0   0      
Investments owned, fair value [5],[6],[8],[9]           58   58      
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(L) – Term Debt 2                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[6]           14,000   14,000      
Investments owned, fair value [5],[6]           14,000   14,000      
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.– Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[6],[9]           4,722   4,722      
Investments owned, fair value [5],[6],[9]           6,342   6,342      
Investment, Identifier [Axis]: Bassett Creek Services, Inc.                      
Summary of Investment Holdings [Line Items]                      
Success fee income     $ 3,000                
Realized gain on preferred equity     4,700                
Net proceeds from the sale of investments     57,600                
Principal repayments of investments     48,000                
Investment, Identifier [Axis]: Bassett Creek Services, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[4]                   4,900  
Investments owned, fair value [2],[4]                   17,150  
Investment, Identifier [Axis]: Bassett Creek Services, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [2]                   48,000  
Investments owned, fair value [2]                   48,000  
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           6,653 [5],[9]   6,653 [5],[9]   6,653 [2],[4]  
Investments owned, fair value           27,980 [5],[9]   27,980 [5],[9]   21,485 [2],[4]  
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 1                      
Summary of Investment Holdings [Line Items]                      
Cost           17,700 [5]   17,700 [5]   17,700 [2]  
Investments owned, fair value           17,700 [5]   17,700 [5]   17,700 [2]  
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 2                      
Summary of Investment Holdings [Line Items]                      
Cost           6,850 [5]   6,850 [5]   6,850 [2]  
Investments owned, fair value           6,850 [5]   6,850 [5]   6,850 [2]  
Investment, Identifier [Axis]: Counsel Press, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           6,995 [5],[9]   6,995 [5],[9]   6,995 [2],[4]  
Investments owned, fair value           27,246 [5],[9]   27,246 [5],[9]   25,374 [2],[4]  
Investment, Identifier [Axis]: Counsel Press, Inc. – Term Debt 1                      
Summary of Investment Holdings [Line Items]                      
Cost           21,100 [5]   21,100 [5]   21,100 [2]  
Investments owned, fair value           21,100 [5]   21,100 [5]   21,100 [2]  
Investment, Identifier [Axis]: Counsel Press, Inc. – Term Debt 2                      
Summary of Investment Holdings [Line Items]                      
Cost           6,400 [5]   6,400 [5]   6,400 [2]  
Investments owned, fair value           6,400 [5]   6,400 [5]   6,400 [2]  
Investment, Identifier [Axis]: Country Club Enterprises, LLC - Guaranty                      
Summary of Investment Holdings [Line Items]                      
Cost [10]                   0  
Investments owned, fair value [10]                   0  
Investment, Identifier [Axis]: Country Club Enterprises, LLC – Guaranty                      
Summary of Investment Holdings [Line Items]                      
Cost [11]           0   0      
Investments owned, fair value [11]           0   0      
Investment, Identifier [Axis]: Country Club Enterprises, LLC – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           1,500 [12]   1,500 [12]   1,500 [13]  
Investments owned, fair value           1,499 [12]   1,499 [12]   1,498 [13]  
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc - Preferred Equity                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[9]           21,000   21,000      
Investments owned, fair value [5],[9]           21,000   21,000      
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc – Line of Credit                      
Summary of Investment Holdings [Line Items]                      
Cost [5]           800   800      
Investments owned, fair value [5]           800   800      
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [5]           38,250   38,250      
Investments owned, fair value [5]           38,250   38,250      
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc.                      
Summary of Investment Holdings [Line Items]                      
Purchase of investments   $ 39,100 $ 21,000                
Investment, Identifier [Axis]: Diligent Delivery Systems – Common Stock Warrants                      
Summary of Investment Holdings [Line Items]                      
Cost           500 [5],[9]   500 [5],[9]   500 [2],[4]  
Investments owned, fair value           1,827 [5],[9]   1,827 [5],[9]   1,533 [2],[4]  
Investment, Identifier [Axis]: Diligent Delivery Systems – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           12,996 [12]   12,996 [12]   12,987 [13]  
Investments owned, fair value           13,000 [12]   13,000 [12]   13,000 [13]  
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           8,199 [5],[6],[9]   8,199 [5],[6],[9]   8,199 [2],[3],[4],[7]  
Investments owned, fair value           0 [5],[6],[9]   0 [5],[6],[9]   0 [2],[3],[4],[7]  
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [3],[13]                   9,210  
Investments owned, fair value [3],[13]                   9,072  
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc.– Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[6]           9,210   9,210      
Investments owned, fair value [5],[6]           3,825   3,825      
Investment, Identifier [Axis]: Educators Resource, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           8,560 [5],[9]   8,560 [5],[9]   8,560 [2],[4]  
Investments owned, fair value           18,937 [5],[9]   18,937 [5],[9]   19,252 [2],[4]  
Investment, Identifier [Axis]: Educators Resource, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           20,000 [5]   20,000 [5]   20,000 [2]  
Investments owned, fair value           20,000 [5]   20,000 [5]   20,000 [2]  
Investment, Identifier [Axis]: Funko Acquisition Holdings, LLC – Common Units                      
Summary of Investment Holdings [Line Items]                      
Cost           21 [6],[9],[14]   21 [6],[9],[14]   30 [3],[4],[15],[16]  
Investments owned, fair value           58 [6],[9],[14]   58 [6],[9],[14]   74 [3],[4],[15],[16]  
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Common Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           11,513 [5],[9]   11,513 [5],[9]   11,513 [2],[4]  
Investments owned, fair value           0 [5],[9]   0 [5],[9]   0 [2],[4]  
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 1                      
Summary of Investment Holdings [Line Items]                      
Cost           6,500 [5]   6,500 [5]   6,500 [2]  
Investments owned, fair value           6,102 [5]   6,102 [5]   6,500 [2]  
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 2                      
Summary of Investment Holdings [Line Items]                      
Cost           18,796 [5]   18,796 [5]   18,796 [2]  
Investments owned, fair value           17,644 [5]   17,644 [5]   18,796 [2]  
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc.                      
Summary of Investment Holdings [Line Items]                      
Purchase of investments $ 4,000                    
Cost                     $ 5,000
Payment to extinguish secured borrowing liability 5,100                    
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Common Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           8 [5],[9]   8 [5],[9]   8 [2],[4]  
Investments owned, fair value           0 [5],[9]   0 [5],[9]   0 [2],[4]  
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           9,583 [5],[9]   9,583 [5],[9]   9,583 [2],[4]  
Investments owned, fair value           0 [5],[9]   0 [5],[9]   3,263 [2],[4]  
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [5]           12,200   12,200      
Investments owned, fair value           12,200 [5]   12,200 [5]   13,300 [3],[17]  
Investment, Identifier [Axis]: Gladstone SOG Investments, Inc. - Common Stock(                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[9]           620   620      
Investments owned, fair value [5],[9]           713   713      
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           0 [5],[9]   0 [5],[9]   10,080 [2],[4]  
Investments owned, fair value           21,454 [5],[9]   21,454 [5],[9]   17,807 [2],[4]  
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           57,700 [5]   57,700 [5]   27,700 [2]  
Investments owned, fair value           57,700 [5]   57,700 [5]   27,700 [2]  
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           6,749 [5],[9]   6,749 [5],[9]   6,749 [2],[4],[7]  
Investments owned, fair value           14,051 [5],[9]   14,051 [5],[9]   16,405 [2],[4],[7]  
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           22,000 [5]   22,000 [5]   22,000 [2],[7]  
Investments owned, fair value           22,000 [5]   22,000 [5]   22,000 [2],[7]  
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Guaranty                      
Summary of Investment Holdings [Line Items]                      
Cost [7],[10]                   0  
Investments owned, fair value [7],[10]                   0  
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 1                      
Summary of Investment Holdings [Line Items]                      
Cost           16,500 [5],[18]   16,500 [5],[18]   16,500 [2],[7],[19]  
Investments owned, fair value           10,900 [5],[18]   10,900 [5],[18]   15,023 [2],[7],[19]  
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 2                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[7],[19]                   26,000  
Investments owned, fair value [2],[7],[19]                   23,672  
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 3                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[7],[19]                   2,438  
Investments owned, fair value [2],[7],[19]                   2,219  
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Line of Credit                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[18]           1,000   1,000      
Investments owned, fair value [5],[18]           660   660      
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt 2                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[18]           26,000   26,000      
Investments owned, fair value [5],[18]           17,176   17,176      
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt 3                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[18]           2,438   2,438      
Investments owned, fair value [5],[18]           1,610   1,610      
Investment, Identifier [Axis]: J.R. Hobbs Co. – Atlanta, LLC – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           10,920 [5],[9]   10,920 [5],[9]   10,920 [2],[4],[7]  
Investments owned, fair value           0 [5],[9]   0 [5],[9]   0 [2],[4],[7]  
Investment, Identifier [Axis]: Mason West, LLC – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           11,206 [5],[9]   11,206 [5],[9]   11,206 [2],[4]  
Investments owned, fair value           5,615 [5],[9]   5,615 [5],[9]   7,553 [2],[4]  
Investment, Identifier [Axis]: Mason West, LLC – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           25,250 [5]   25,250 [5]   25,250 [2]  
Investments owned, fair value           25,250 [5]   25,250 [5]   25,250 [2]  
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Line of Credit                      
Summary of Investment Holdings [Line Items]                      
Cost           0 [5]   0 [5]   0 [2]  
Investments owned, fair value           0 [5]   0 [5]   0 [2]  
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           6,600 [5],[9]   6,600 [5],[9]   6,600 [2],[4]  
Investments owned, fair value           19,040 [5],[9]   19,040 [5],[9]   10,223 [2],[4]  
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           34,050 [5]   34,050 [5]   27,700 [2]  
Investments owned, fair value           34,050 [5]   34,050 [5]   27,700 [2]  
Investment, Identifier [Axis]: Nth Degree Investment Group, LLC – Common Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           1,219 [5],[9]   1,219 [5],[9]   1,219 [2],[4]  
Investments owned, fair value           8,191 [5],[9]   8,191 [5],[9]   511 [2],[4]  
Investment, Identifier [Axis]: Old World Christmas, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           0 [5],[9]   0 [5],[9]   0 [2],[4],[7]  
Investments owned, fair value           43,629 [5],[9]   43,629 [5],[9]   37,842 [2],[4],[7]  
Investment, Identifier [Axis]: Old World Christmas, Inc. – Secured First Lien Term Loan                      
Summary of Investment Holdings [Line Items]                      
Cost           25,000 [5]   25,000 [5]   25,000 [2],[7]  
Investments owned, fair value           25,000 [5]   25,000 [5]   25,000 [2],[7]  
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[4],[7]                   19,730  
Investments owned, fair value [2],[4],[7]                   0  
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock(                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[9]           19,730   19,730      
Investments owned, fair value [5],[9]           0   0      
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           26,618 [5]   26,618 [5]   26,618 [2]  
Investments owned, fair value           23,642 [5]   23,642 [5]   26,618 [2]  
Investment, Identifier [Axis]: Phoenix Door Systems, Inc – Line of Credit                      
Summary of Investment Holdings [Line Items]                      
Cost [12]           2,550   2,550      
Investments owned, fair value [12]           2,410   2,410      
Investment, Identifier [Axis]: Phoenix Door Systems, Inc – Line of Credit,                      
Summary of Investment Holdings [Line Items]                      
Cost [13]                   2,000  
Investments owned, fair value [13]                   1,920  
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Common Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           1,452 [5],[9]   1,452 [5],[9]   1,452 [2],[4]  
Investments owned, fair value           0 [5],[9]   0 [5],[9]   0 [2],[4]  
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           3,200 [12]   3,200 [12]   3,200 [13]  
Investments owned, fair value           3,024 [12]   3,024 [12]   3,072 [13]  
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Common Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           222 [5],[9]   222 [5],[9]   222 [2],[4],[16]  
Investments owned, fair value           0 [5],[9]   0 [5],[9]   0 [2],[4],[16]  
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           4,643 [5],[9]   4,643 [5],[9]   4,643 [2],[4]  
Investments owned, fair value           2,543 [5],[9]   2,543 [5],[9]   0 [2],[4]  
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt 1                      
Summary of Investment Holdings [Line Items]                      
Cost           3,128 [5]   3,128 [5]   3,128 [13],[19]  
Investments owned, fair value           3,128 [5]   3,128 [5]   2,909 [13],[19]  
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt 2                      
Summary of Investment Holdings [Line Items]                      
Cost           11,736 [5]   11,736 [5]   11,736 [13],[19]  
Investments owned, fair value           11,736 [5]   11,736 [5]   10,914 [13],[19]  
Investment, Identifier [Axis]: Schylling, Inc. – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           4,000 [5],[9]   4,000 [5],[9]   4,000 [2],[4]  
Investments owned, fair value           16,475 [5],[9]   16,475 [5],[9]   17,820 [2],[4]  
Investment, Identifier [Axis]: Schylling, Inc. – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           27,981 [5]   27,981 [5]   27,981 [2]  
Investments owned, fair value           27,981 [5]   27,981 [5]   27,981 [2]  
Investment, Identifier [Axis]: The Maids International, LLC – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           6,640 [5],[9]   6,640 [5],[9]   6,640 [2],[4],[7]  
Investments owned, fair value           0 [5],[9]   0 [5],[9]   2,679 [2],[4],[7]  
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[7]                   28,560  
Investments owned, fair value [2],[7]                   28,560  
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [5]           28,560   28,560      
Investments owned, fair value [5]           28,560   28,560      
Investment, Identifier [Axis]: The Mountain Corporation 1                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[7],[19]                   3,400  
Investments owned, fair value [2],[7],[19]                   3,400  
Investment, Identifier [Axis]: The Mountain Corporation 2                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[7],[19]                   800  
Investments owned, fair value [2],[7],[19]                   800  
Investment, Identifier [Axis]: The Mountain Corporation – Common Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           1 [5],[9]   1 [5],[9]   1 [2],[4]  
Investments owned, fair value           0 [5],[9]   0 [5],[9]   0 [2],[4]  
Investment, Identifier [Axis]: The Mountain Corporation – Delayed Draw Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           1,500 [5],[18]   1,500 [5],[18]   1,500 [2],[7],[19]  
Investments owned, fair value           0 [5],[18]   0 [5],[18]   118 [2],[7],[19]  
Investment, Identifier [Axis]: The Mountain Corporation – Line of Credit 1                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[18]           3,400   3,400      
Investments owned, fair value [5],[18]           2,411   2,411      
Investment, Identifier [Axis]: The Mountain Corporation – Line of Credit 2                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[18]           900   900      
Investments owned, fair value [5],[18]           0   0      
Investment, Identifier [Axis]: The Mountain Corporation – Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[4]                   6,899  
Investments owned, fair value [2],[4]                   0  
Investment, Identifier [Axis]: The Mountain Corporation – Preferred Stock(                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[9]           6,899   6,899      
Investments owned, fair value [5],[9]           0   0      
Investment, Identifier [Axis]: The Mountain Corporation – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[7],[19]                   11,700  
Investments owned, fair value [2],[7],[19]                   923  
Investment, Identifier [Axis]: The Mountain Corporation – Term Debt                      
Summary of Investment Holdings [Line Items]                      
Cost [5],[18]           11,700   11,700      
Investments owned, fair value [5],[18]           0   0      
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd. - Preferred Stock                      
Summary of Investment Holdings [Line Items]                      
Cost           6,000 [5],[9]   6,000 [5],[9]   6,000 [2],[4],[7]  
Investments owned, fair value           5,118 [5],[9]   5,118 [5],[9]   6,000 [2],[4],[7]  
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 2                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[7]                   18,250  
Investments owned, fair value [2],[7]                   18,250  
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 1                      
Summary of Investment Holdings [Line Items]                      
Cost [2],[7]                   0  
Investments owned, fair value [2],[7]                   0  
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 2                      
Summary of Investment Holdings [Line Items]                      
Cost [5]           18,250   18,250      
Investments owned, fair value [5]           18,250   18,250      
Secured First Lien Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           444,089   444,089   429,457  
Investments owned, fair value           420,907   420,907   425,087  
Secured First Lien Debt | Investment, Identifier [Axis]: Ginsey Home Solutions, Inc.                      
Summary of Investment Holdings [Line Items]                      
Cost 12,200                    
Secured First Lien Debt | Investment, Identifier [Axis]: Horizon Facilities Services, Inc.                      
Summary of Investment Holdings [Line Items]                      
Purchase of investments   30,000                  
Secured First Lien Debt | Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc.                      
Summary of Investment Holdings [Line Items]                      
Purchase of investments       $ 6,400              
Preferred Equity                      
Summary of Investment Holdings [Line Items]                      
Cost           149,099   149,099   143,079  
Investments owned, fair value           229,430   229,430   217,599  
Preferred Equity | Investment, Identifier [Axis]: Horizon Facilities Services, Inc.                      
Summary of Investment Holdings [Line Items]                      
Success fee income   1,700                  
Realized gain on preferred equity   2,200                  
Proceeds from equity   12,300                  
Cost   10,100                  
Dividend income   $ 3,100                  
Secured Second Lien Debt                      
Summary of Investment Holdings [Line Items]                      
Cost           94,474   94,474   81,147  
Investments owned, fair value           $ 76,751   $ 76,751   $ 67,958  
Secured Second Lien Debt | Investment, Identifier [Axis]: Ginsey Home Solutions, Inc.                      
Summary of Investment Holdings [Line Items]                      
Purchase of investments         $ 100            
Cost [3],[17] $ 13,300                    
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $140.8 million; cumulative gross unrealized depreciation for federal income tax purposes is $97.1 million. Cumulative net unrealized appreciation is $43.8 million, based on a tax cost of $670.6 million.
[2] Fair value was based on the total enterprise value of the portfolio company, which is generally allocated to the portfolio company’s securities in order of their relative priority in the capital structure. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[3] One of our affiliated funds, Gladstone Capital Corporation, co-invested with us in this portfolio company pursuant to an exemptive order granted by the U.S. Securities and Exchange Commission.
[4] Security is non-income producing.
[5] Fair value was based on the total enterprise value of the portfolio company, which is generally allocated to the portfolio company’s securities in order of their relative priority in the capital structure. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[6] One of our affiliated funds, Gladstone Capital Corporation, co-invested with us in this portfolio company pursuant to an exemptive order granted by the U.S. Securities and Exchange Commission.
[7] Affiliate investments, as defined by the 1940 Act, are those that are not Control investments and in which we own, with the power to vote, between and inclusive of 5.0% and 25.0% of the issued and outstanding voting securities.
[8] Affiliate investments, as defined by the 1940 Act, are those that are not Control investments and in which we own, with the power to vote, between and inclusive of 5.0% and 25.0% of the issued and outstanding voting securities.
[9] Security is non-income producing.
[10] Refer to Note 10—Commitments and Contingencies in the accompanying Notes to Consolidated Financial Statements for additional information regarding this guaranty.
[11] Refer to Note 10—Commitments and Contingencies in the accompanying Notes to Consolidated Financial Statements for additional information regarding this guaranty.
[12] Fair value was based on internal yield analysis or on estimates of value submitted by ICE Data Pricing and Reference Data, LLC. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[13] Fair value was based on internal yield analysis or on estimates of value submitted by ICE Data Pricing and Reference Data, LLC. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[14] Our investment in Funko was valued using Level 2 inputs within the ASC 820 fair value hierarchy. Our common units in Funko are convertible into class A common stock in Funko, Inc. upon meeting certain requirements. Fair value was based on the closing market price of shares of Funko, Inc. as of the reporting date, less a discount for lack of marketability. Funko, Inc. is traded on the Nasdaq Global Select Market under the trading symbol “FNKO.” Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[15] Our investment in Funko was valued using Level 2 inputs within the ASC 820 fair value hierarchy. Our common units in Funko are convertible into class A common stock in Funko, Inc. upon meeting certain requirements. Fair value was based on the closing market price of shares of Funko, Inc. as of the reporting date, less a discount for lack of marketability. Funko, Inc. is traded on the Nasdaq Global Select Market under the trading symbol “FNKO.” Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[16] Non-Control/Non-Affiliate investments, as defined by the 1940 Act, are those that are neither Control nor Affiliate investments and in which we own less than 5.0% of the issued and outstanding voting securities.
[17] $5.1 million of the debt security was participated to a third-party, but is accounted for as collateral for a secured borrowing under accounting principles generally accepted in the U.S. and presented as Secured borrowing on our accompanying Consolidated Statements of Assets and Liabilities as of March 31, 2022.
[18] Debt security is on non-accrual status.
[19] Debt security is on non-accrual status.