Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS - Narrative (Details)

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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2022
Related Party Transaction [Line Items]          
Base management fee 2.00% 2.00% 2.00% 2.00%  
Base management fee, percent fee     100.00%    
Investment company, excess expense reimbursable $ 40,000 $ 100,000 $ 100,000 $ 200,000  
Maximum base management fee paid cannot exceed a percentage of total assets     2.00%    
Ratio of net investment income (loss) to average net assets – annualized 5.15% 2.68% 5.50% (0.96%)  
Incentive fee base on minimum rate of return required on investment     $ 0    
Percentage of pre-incentive fee net investment income is less than the hurdle rate     100.00%    
Investment company, pre-incentive fee net investment income, percent threshold of net assets     2.1875%    
Pre-incentive fee net investment income exceeds the hurdle rate     20.00%    
Investment company, capital gains-based incentive fees 20.00%   20.00%    
Investment company, capital gains-based incentive fees     $ 0   $ 5,300,000
Investment company, capital gains-based incentive fees payable (reversal) $ 1,400,000 $ 400,000 700,000 $ 16,300,000  
Administration fee [1] 410,000 437,000 1,352,000 1,407,000  
Success fee income 1,061,000 3,398,000 7,794,000 8,080,000  
Due from related parties 16,000   $ 16,000   $ 27,000
Minimum          
Related Party Transaction [Line Items]          
Ratio of net investment income (loss) to average net assets – annualized     1.75%    
Affiliated Entity          
Related Party Transaction [Line Items]          
Success fee income $ 300,000 $ 2,800,000 $ 1,600,000 $ 3,200,000  
Adviser | David Gladstone | Chief Executive Officer          
Related Party Transaction [Line Items]          
Noncontrolling interest, ownership percentage by parent 100.00%   100.00%    
Administrator | David Gladstone | Chief Executive Officer          
Related Party Transaction [Line Items]          
Noncontrolling interest, ownership percentage by parent 100.00%   100.00%    
Gladstone Securities, LLC | David Gladstone | Chief Executive Officer          
Related Party Transaction [Line Items]          
Noncontrolling interest, ownership percentage by parent 100.00%   100.00%    
[1] Refer to Note 4 — Related Party Transactions in the accompanying Notes to Consolidated Financial Statements for additional information.