Annual report pursuant to Section 13 and 15(d)

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

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INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2022
Jul. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Aug. 31, 2012
New investments, repayments and settlements:            
Cost     $ 720,630 [1] $ 669,248 [2]    
Fair value     753,543 [1] 714,396 [2]    
Old World Christmas, Inc.            
New investments, repayments and settlements:            
Realized gain on preferred equity $ 13,400          
Proceeds from equity $ 17,900          
Horizon Facilities Services, Inc.            
New investments, repayments and settlements:            
Cost   $ 10,100        
Realized gain on preferred equity   2,200        
Proceeds from equity   $ 12,300        
Ginsey Home Solutions, Inc.            
New investments, repayments and settlements:            
Cost     12,200     $ 5,000
Fair value     12,200      
PSI Molded Plastics, Inc            
New investments, repayments and settlements:            
Cost     26,600      
Fair value     26,600      
J.R. Hobbs Co. - Atlanta, LLC            
New investments, repayments and settlements:            
Cost       52,500    
Fair value       52,400    
D.P.M.S., Inc. ("Danco")            
New investments, repayments and settlements:            
Cost       12,300    
Fair value       7,300    
Galaxy Technologies, Inc. ("Galaxy")            
New investments, repayments and settlements:            
Cost       11,500    
Fair value       16,000    
SOG Specialty Knives & Tools, LLC            
New investments, repayments and settlements:            
Cost       600    
Fair value       0    
Total            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning balance     753,516 714,322 $ 633,734  
New investments, repayments and settlements:            
Issuances / originations     133,768 92,758    
Settlements / repayments     (57,396) (51,398)    
Sales     (35,758) (49,394)    
Transfers     0 0    
Ending balance     753,516 714,322    
Total | Debt and Equity Securities, Realized Gain (Loss)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Total gain (loss)     10,778 13,725    
Total | Debt and Equity Securities, Unrealized Gain (Loss)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Total gain (loss)     (9,949) 100,090    
Reversal of previously recorded (appreciation) depreciation upon realization     (2,249) (25,193)    
Secured First Lien Debt            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning balance     437,517 425,087 368,688  
New investments, repayments and settlements:            
Issuances / originations     107,200 68,638    
Settlements / repayments     (50,800) (48,898)    
Sales     0 0    
Transfers     (14,418) 45,043    
Ending balance     437,517 425,087    
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 (10,000)    
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)     (29,552) 756    
Reversal of previously recorded (appreciation) depreciation upon realization     0 860    
Secured Second Lien Debt            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning balance     75,734 67,958 102,897  
New investments, repayments and settlements:            
Issuances / originations     5,188 9,648    
Settlements / repayments     (6,596) (2,500)    
Sales     0 0    
Transfers     14,418 (45,043)    
Ending balance     75,734 67,958    
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)     (10,000) 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)     (5,235) 2,956    
Reversal of previously recorded (appreciation) depreciation upon realization     10,001 0    
Preferred Equity            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning balance     222,585 217,599 159,478  
New investments, repayments and settlements:            
Issuances / originations     21,000 14,472    
Settlements / repayments     0 0    
Sales     (35,758) (49,394)    
Transfers     0 (16,034)    
Ending balance     222,585 217,599    
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)     20,778 23,725    
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)     11,216 111,405    
Reversal of previously recorded (appreciation) depreciation upon realization     (12,250) (26,053)    
Common Equity/ Equivalents            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning balance     17,680 3,678 $ 2,671  
New investments, repayments and settlements:            
Issuances / originations     380 0    
Settlements / repayments     0 0    
Sales     0 0    
Transfers     0 16,034    
Ending balance     17,680 3,678    
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    
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)     13,622 (15,027)    
Reversal of previously recorded (appreciation) depreciation upon realization     $ 0 $ 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.
[2] 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.