Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS - Narrative (Details)

v3.22.4
RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended 24 Months Ended 36 Months Ended
Apr. 11, 2022
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2023
Mar. 31, 2023
Apr. 11, 2022
Mar. 31, 2022
Mar. 31, 2023
Sep. 30, 2022
Related Party Transaction [Line Items]                  
Base management fee   1.75% 1.75%            
Base management fee, percent fee   100.00%              
Management and service fee, net of credit   0.50% 0.50%            
Management and service fees, loans   1.50%              
Ratio of net investment income (loss) to average net assets – annualized 2.1875% 7.87% 7.22%     2.4375%      
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%         2.4375%    
Pre-incentive fee net investment income exceeds the hurdle rate   20.00%              
Investment company, investment income (loss) ratio, before incentive allocation, annualized 8.75%         9.75%      
Investment company, capital gains-based incentive fees   20.00%              
Success fee income   $ 0 $ 1,563,000            
Investment company, other operating expenses, due to advisor   19,000             $ 44,000
Fees due to related party   3,655,000             2,527,000
Forecast                  
Related Party Transaction [Line Items]                  
Ratio of net investment income (loss) to average net assets – annualized       2.50%          
Investment company, pre-incentive fee net investment income, percent threshold of net assets         2.50%        
Investment company, investment income (loss) ratio, before incentive allocation, annualized       10.00%          
Gladstone Investment Corporation                  
Related Party Transaction [Line Items]                  
Fees due to related party   16,000             $ 13,000
Affiliated Entity                  
Related Party Transaction [Line Items]                  
Success fee income   $ 16,000 $ 600,000            
Adviser | David Gladstone | Chief Executive Officer                  
Related Party Transaction [Line Items]                  
Noncontrolling interest, ownership percentage by parent   100.00%              
Administrator | David Gladstone | Chief Executive Officer                  
Related Party Transaction [Line Items]                  
Noncontrolling interest, ownership percentage by parent   100.00%              
Gladstone Securities, LLC | David Gladstone | Chief Executive Officer                  
Related Party Transaction [Line Items]                  
Noncontrolling interest, ownership percentage by parent   100.00%              
Maximum                  
Related Party Transaction [Line Items]                  
Base management fee   1.75%              
Minimum                  
Related Party Transaction [Line Items]                  
Ratio of net investment income (loss) to average net assets – annualized   1.75%              
Minimum | Forecast                  
Related Party Transaction [Line Items]                  
Ratio of net investment income (loss) to average net assets – annualized               2.00%