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RELATED-PARTY TRANSACTIONS - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 09, 2022 | Dec. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($)
Series C Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001 |
Series E Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001 |
Series E Preferred Stock | Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Dividend rate | 5.00% |  |  |
Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Notice period for termination of agreement without cause |  | 120 days |  |
Termination agreement, percentage of independent directors |  | 66.67% |  |
Multiplier |  | 3 |  |
Period prior to termination |  | 24 months |  |
Advisory Agreement - Base Rate, Annualized Rate | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, base rate |  | 0.60% |  |
Advisory Agreement - Base Rate, Quarterly Rate | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, base rate |  | 0.15% |  |
Advisory Agreement - Incentive Rate, Quarterly Hurdle Rate | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, incentive rate |  | 1.75% |  |
Advisory Agreement - Incentive Rate, Annualized Hurdle Rate | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, incentive rate |  | 7.00% |  |
Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, incentive rate |  | 100.00% |  |
Advisory Agreement - Incentive Rate, Quarterly Catch-Up Threshold | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, incentive rate |  | 2.1875% |  |
Advisory Agreement - Incentive Rate, Annualized Catch-Up Threshold | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, incentive rate |  | 8.75% |  |
Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, incentive rate |  | 20.00% |  |
Advisory Agreement - Incentive Rate, Realized Capital Gains | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Management and service fees, incentive rate |  | 15.00% |  |
Financing Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total due to related parties | $ |  | $ 0 | $ 0 | $ 154
Financing Arrangement Agreement, Percentage of Gross Proceeds | Gladstone Securities | Minimum |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 0.50% |  |
Financing Arrangement Agreement, Percentage of Gross Proceeds | Gladstone Securities | Maximum |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 1.00% |  |
Financing Arrangement Agreement, Percentage Of Financing Fees Paid |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 0.14% |  |
Dealer-Manager Agreements | Series C Preferred Stock | Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.001 |  |
Dividend rate |  | 6.00% |  |
Dealer-Manager Agreements | Series E Preferred Stock | Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.001 |  |
Dividend rate |  | 5.00% |  |
Dealer-Manager Agreements, Selling Commissions of Gross Proceeds from Sales | Series C Preferred Stock | Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 6.00% |  |
Dealer-Manager Agreements, Selling Commissions of Gross Proceeds from Sales | Series E Preferred Stock | Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 7.00% |  |
Dealer-Manager Agreements, Dealer-Manager Fee of Gross Proceeds from Sales | Series C Preferred Stock | Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 3.00% |  |
Dealer-Manager Agreements, Dealer-Manager Fee of Gross Proceeds from Sales | Series E Preferred Stock | Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, rate |  | 3.00% |  |

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