Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Mar. 31, 2023
Summary of Investment Holdings [Line Items]    
Cost $ 868,504 $ 720,630 [1]
Fair Value 902,808 753,543 [1]
J.R. Hobbs Co. and The Mountain Corporation    
Summary of Investment Holdings [Line Items]    
Cost $ 66,900  
Cost percentage 10.00%  
Fair Value $ 30,900  
Fair value percentage 5.00%  
J.R. Hobbs, The Mountain and SFEG Holdings, Inc.    
Summary of Investment Holdings [Line Items]    
Cost   $ 66,900
Cost percentage   12.00%
Fair Value   $ 31,700
Fair value percentage   6.20%
[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.