Quarterly report pursuant to Section 13 or 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 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Mar. 31, 2023
Aug. 31, 2022
Mar. 31, 2022
New investments, repayments and settlements:                      
Cost   $ 868,504       $ 868,504     $ 720,630 [1]    
Fair Value   902,808       902,808     753,543 [1]    
Old World Christmas, Inc.                      
New investments, repayments and settlements:                      
Realized gain (loss) on preferred equity $ 300     $ 13,400 $ 13,400 300          
Horizon Facilities Services, Inc.                      
New investments, repayments and settlements:                      
Realized gain (loss) on preferred equity       (12,300) (12,300)            
Ginsey Home Solutions, Inc.                      
New investments, repayments and settlements:                      
Cost                   $ 12,200  
Fair Value                   $ 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   902,786 $ 760,432 737,877 737,877 902,786 $ 760,432 $ 915,614 753,516   $ 714,322
New investments, repayments and settlements:                      
Issuances / originations   68,200 31,463     182,988 133,518        
Settlements / repayments   (27,500) (2,300)     (27,500) (55,396)        
Sales   (50,453) (13,372)     (52,228) (35,298)        
Transfers   0 0     0 0        
Ending balance   902,786 760,432 737,877 737,877 902,786 760,432        
Total | Debt and Equity Securities, Realized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)   43,459 3,372     44,614 10,318        
Total | Debt and Equity Securities, Unrealized Gain (Loss)                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Total gain (loss)   (2,968) (6,609)     45,055 (4,783)        
Reversal of previously recorded (appreciation) depreciation upon realization   (43,566) 10,001     (43,659) (2,249)        
Secured First Lien Debt                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance   476,126 447,491 420,907 420,907 476,126 447,491 508,504 437,517   425,087
New investments, repayments and settlements:                      
Issuances / originations   3,500 29,900     73,600 106,950        
Settlements / repayments   (27,500) (800)     (27,500) (48,800)        
Sales   0 0     0 0        
Transfers   0 0     0 (14,418)        
Ending balance   476,126 447,491 420,907 420,907 476,126 447,491        
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)   (7,040) (2,516)     (6,153) (21,328)        
Reversal of previously recorded (appreciation) depreciation upon realization   (1,338) 0     (1,338) 0        
Secured Second Lien Debt                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance   137,480 76,169 76,751 76,751 137,480 76,169 102,747 75,734   67,958
New investments, repayments and settlements:                      
Issuances / originations   39,000 1,183     64,000 5,188        
Settlements / repayments   0 (1,500)     0 (6,596)        
Sales   0 0     0 0        
Transfers   0 0     0 14,418        
Ending balance   137,480 76,169 76,751 76,751 137,480 76,169        
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 (10,000)     0 (10,000)        
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)   (4,267) (266)     (2,254) (4,800)        
Reversal of previously recorded (appreciation) depreciation upon realization   0 10,001     0 10,001        
Preferred Equity                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance   214,664 221,774 229,430 229,430 214,664 221,774 267,596 222,585   217,599
New investments, repayments and settlements:                      
Issuances / originations   0 0     14,688 21,000        
Settlements / repayments   0 0     0 0        
Sales   (50,453) (13,372)     (50,726) (35,298)        
Transfers   (8,621) 0     (8,621) 0        
Ending balance   214,664 221,774 229,430 229,430 214,664 221,774        
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)   43,459 13,372     43,732 20,318        
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)   4,911 (7,656)     35,234 10,405        
Reversal of previously recorded (appreciation) depreciation upon realization   (42,228) 0     (42,228) (12,250)        
Common Equity/ Equivalents                      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                      
Beginning balance   74,516 14,998 10,789 10,789 74,516 14,998 $ 36,767 $ 17,680   $ 3,678
New investments, repayments and settlements:                      
Issuances / originations   25,700 380     30,700 380        
Settlements / repayments   0 0     0 0        
Sales   0 0     (1,502) 0        
Transfers   8,621 0     8,621 0        
Ending balance   74,516 14,998 $ 10,789 $ 10,789 74,516 14,998        
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)   3,428 3,829     18,228 10,940        
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.