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Related Party Transactions (Details) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 11, 2023 | Feb. 20, 2020 $ / shares shares | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) quarter officer | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of executive officers | officer |  |  |  |  |  | 1 |  |
Advisory Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of quarters used for the cap of average quarterly incentive fees | quarter |  |  |  |  |  | 4 |  |
Advisory Agreement - Base Management Fee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | $ 1,600,000 | $ 1,500,000 | $ 3,200,000 | $ 3,100,000 |
Advisory Agreement - Incentive Rate, Realized Capital Gains |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | 0 | 0 | 0 | 0 |
Administrative Agreement - Administrative Fee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | 600,000 | 600,000 | 1,200,000 | 1,200,000 |
Mortgage Financing Arrangement Agreement - Financing Fees | Gladstone Securities, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | 0 | $ 9,233 | $ 0 | $ 9,233 |
Mortgage Financing Arrangement Agreement - Financing Fees | Minimum | Gladstone Securities, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, rate |  |  |  |  |  | 0.15% |  |
Mortgage Financing Arrangement Agreement - Financing Fees | Maximum | Gladstone Securities, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, rate |  |  |  |  |  | 1.00% |  |
Mortgage Financing Arrangement Agreement - Percentage of Mortgage Principal Secured | Gladstone Securities, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, rate |  |  |  |  | 0.13% |  | 0.13% |
Dealer Manager Agreement | Gladstone Securities, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | 4,950,000 | $ 40,000.00 | $ 30,000.00 | $ 60,000.00 |
Dealer Manager Agreement - Selling Commission Percentage of Gross Proceeds from Sales |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, rate |  |  | 6.00% |  |  |  |  |
Dealer Manager Agreement - Dealer Management Fee Percentage of Gross Proceeds from Sale of Preferred Stock in Primary Offering |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, rate |  |  | 3.00% |  |  |  |  |
Related Party |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Amount due to advisor and administrator | [1] |  |  | $ 3,011,000 |  | $ 3,011,000 |  | $ 2,540,000
Affiliated Entity | Advisory Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Notice period for termination of agreement without cause |  |  |  |  |  | 120 days |  |
Percentage of independent directors required to terminate the amended advisory agreement |  |  |  |  |  | 66.67% |  |
Number of times the sum of the average annual base management fee and incentive fee earned by adviser |  |  |  | 2 |  | 2 |  |
Period prior to termination |  |  |  |  |  | 24 months |  |
Notice period for termination of agreement with cause |  |  |  |  |  | 30 days |  |
Affiliated Entity | Advisory Agreement - Base Rate, Annualized Rate |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management and service fees, base rate |  |  |  |  |  | 0.425% |  |
Affiliated Entity | Advisory Agreement - Base Rate, Quarterly Rate |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management and service fees, base rate |  |  |  |  |  | 0.10625% |  |
Affiliated Entity | Advisory Agreement - Incentive Rate, Quarterly Hurdle Rate |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management and service fees, incentive rate |  |  |  |  |  | 2.00% |  |
Affiliated Entity | Advisory Agreement - Incentive Rate, Annualized Hurdle Rate |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management and service fees, incentive rate |  |  |  |  |  | 8.00% |  |
Affiliated Entity | Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management and service fees, incentive rate |  |  |  |  |  | 15.00% |  |
Affiliated Entity | Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management and service fees, incentive rate |  |  |  |  |  | 15.00% |  |
Affiliated Entity | Eight Amended Advisory Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management and service fees, incentive rate |  | 15.00% |  |  |  |  |  |
Affiliated Entity | Advisory Agreement - Incentive Fees |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | $ 700,000 | 1,200,000 | $ 1,300,000 | 2,400,000 |
Investment company, voluntary fee waived |  |  |  | $ 700,000 | $ 300,000 | $ 700,000 | $ 1,000,000.0 |
Affiliated Entity | Advisory Agreement - Incentive Rate, Realized Capital Gains |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management and service fees, incentive rate |  |  |  |  |  | 15.00% |  |
Affiliated Entity | Advisory Agreement - Termination Fee Payable as a Percentage of Management and Incentive Fees Earned by Adviser |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, rate |  |  |  |  |  | 200.00% |  |
Affiliated Entity | Dealer Manager Agreement | Gladstone Securities, LLC | Series F Cumulative Redeemable Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Redeemable preferred stock, shares authorized (in shares) | shares |  |  | 20,000,000 |  |  |  |  |
Redeemable preferred stock, dividend rate |  |  | 6.00% |  |  |  |  |
Redeemable preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 |  |  |  |  |
Redeemable preferred stock, dividend reinvestment plan, shares authorized (in shares) | shares |  |  | 6,000,000 |  |  |  |  |
[1] | Refer to Note 2 “Related-Party Transactions”

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