Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details)

v3.23.3
INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
New investments, repayments and settlements:                
Cost   $ 834,798   $ 834,798   $ 720,630 [1]    
Fair Value   915,636   915,636   753,543 [1]    
Old World Christmas, Inc.                
New investments, repayments and settlements:                
Realized gain (loss) on preferred equity $ 300     300        
Horizon Facilities Services, Inc.                
New investments, repayments and settlements:                
Realized gain (loss) on preferred equity     $ (10,100)   $ (10,100)      
Ginsey Home Solutions, Inc.                
New investments, repayments and settlements:                
Cost     12,200   12,200      
Fair Value     12,200   12,200      
PSI Molded Plastics, Inc                
New investments, repayments and settlements:                
Cost     26,600   26,600      
Fair Value     26,600   26,600      
Total                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Beginning balance 800,047 915,614 737,877 915,614 737,877 753,516 $ 689,425 $ 714,322
New investments, repayments and settlements:                
Issuances / originations   66,813 74,250 114,788 102,055      
Settlements / repayments   0 (5,096) 0 (53,096)      
Sales   0 (12,298) (1,775) (21,926)      
Transfers   0 0 0 0      
Ending balance 800,047 915,614 737,877 915,614 737,877      
Total | Debt and Equity Securities, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   0 2,218 1,155 6,946      
Total | Debt and Equity Securities, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   48,754 (10,622) 48,023 1,826      
Reversal of previously recorded (appreciation) depreciation upon realization   0 0 (93) (12,250)      
Secured First Lien Debt                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Beginning balance 452,215 508,504 420,907 508,504 420,907 437,517 376,752 425,087
New investments, repayments and settlements:                
Issuances / originations   55,400 70,250 70,100 77,050      
Settlements / repayments   0 0 0 (48,000)      
Sales   0 0 0 0      
Transfers   0 (14,418) 0 (14,418)      
Ending balance 452,215 508,504 420,907 508,504 420,907      
Secured First Lien Debt | Debt and Equity Securities, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   0 0 0 0      
Secured First Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   889 (11,677) 887 (18,812)      
Reversal of previously recorded (appreciation) depreciation upon realization   0 0 0 0      
Secured Second Lien Debt                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Beginning balance 104,794 102,747 76,751 102,747 76,751 75,734 67,936 67,958
New investments, repayments and settlements:                
Issuances / originations   0 4,000 25,000 4,005      
Settlements / repayments   0 (5,096) 0 (5,096)      
Sales   0 0 0 0      
Transfers   0 14,418 0 14,418      
Ending balance 104,794 102,747 76,751 102,747 76,751      
Secured Second Lien Debt | Debt and Equity Securities, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   0 0 0 0      
Secured Second Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   (2,047) (4,507) 2,013 (4,534)      
Reversal of previously recorded (appreciation) depreciation upon realization   0 0 0 0      
Preferred Equity                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Beginning balance 214,258 267,596 229,430 267,596 229,430 222,585 238,665 217,599
New investments, repayments and settlements:                
Issuances / originations   11,413 0 14,688 21,000      
Settlements / repayments   0 0 0 0      
Sales   0 (12,298) (273) (21,926)      
Transfers   0 0 0 0      
Ending balance 214,258 267,596 229,430 267,596 229,430      
Preferred Equity | Debt and Equity Securities, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   0 2,218 273 6,946      
Preferred Equity | Debt and Equity Securities, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   41,925 845 30,323 18,061      
Reversal of previously recorded (appreciation) depreciation upon realization   0 0 0 (12,250)      
Common Equity/ Equivalents                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Beginning balance 28,780 36,767 10,789 36,767 10,789 $ 17,680 $ 6,072 $ 3,678
New investments, repayments and settlements:                
Issuances / originations   0 0 5,000 0      
Settlements / repayments   0 0 0 0      
Sales   0 0 (1,502) 0      
Transfers   0 0 0 0      
Ending balance $ 28,780 36,767 10,789 36,767 10,789      
Common Equity/ Equivalents | Debt and Equity Securities, Realized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   0 0 882 0      
Common Equity/ Equivalents | Debt and Equity Securities, Unrealized Gain (Loss)                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Total gain (loss)   7,987 4,717 14,800 7,111      
Reversal of previously recorded (appreciation) depreciation upon realization   $ 0 $ 0 $ (93) $ 0      
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $150.4 million; cumulative gross unrealized depreciation for federal income tax purposes is $119.3 million. Cumulative net unrealized appreciation is $31.1 million, based on a tax cost of $722.4 million.