Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions (Details)

v3.24.0.1
Related-Party Transactions (Details)
 1 Months Ended 12 Months Ended
Jul. 11, 2023
Jul. 14, 2020
Feb. 20, 2020
$ / shares
shares
Feb. 29, 2020
Dec. 31, 2023
USD ($)
quarter
officer
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Related Party Transaction [Line Items]              
Number of executive officers | officer         2    
Related Party              
Related Party Transaction [Line Items]              
Amount due to advisor and administrator [1]         $ 2,556,000 $ 3,356,000  
Advisory Agreement              
Related Party Transaction [Line Items]              
Number of quarters used for the cap of average quarterly incentive fees | quarter         4    
Advisory Agreement | Affiliated Entity              
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    
Period prior to termination         24 months    
Notice period for termination of agreement with cause         30 days    
Advisory Agreement - Base Rate, Annualized Rate | Affiliated Entity              
Related Party Transaction [Line Items]              
Management and service fees, base rate   0.425%          
Advisory Agreement - Base Rate, Quarterly Rate | Affiliated Entity              
Related Party Transaction [Line Items]              
Management and service fees, base rate   0.10625%          
Advisory Agreement - Base Management Fee              
Related Party Transaction [Line Items]              
Related party transaction, amounts of transaction         $ 6,400,000 6,300,000 $ 5,900,000
Advisory Agreement - Incentive Rate, Quarterly Hurdle Rate | Affiliated Entity              
Related Party Transaction [Line Items]              
Management and service fees, incentive rate         2.00%    
Advisory Agreement - Incentive Rate, Annualized Hurdle Rate | Affiliated Entity              
Related Party Transaction [Line Items]              
Management and service fees, incentive rate         8.00%    
Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold | Affiliated Entity              
Related Party Transaction [Line Items]              
Management and service fees, incentive rate         15.00%    
Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold | Affiliated Entity              
Related Party Transaction [Line Items]              
Management and service fees, incentive rate         15.00%    
Eight Amended Advisory Agreement | Affiliated Entity              
Related Party Transaction [Line Items]              
Management and service fees, incentive rate 15.00%            
Advisory Agreement - Incentive Fees | Affiliated Entity              
Related Party Transaction [Line Items]              
Related party transaction, amounts of transaction           5,300,000 4,900,000
Contractual fee waived         $ 4,600,000    
Investment company, voluntary fee waived           0 20,000.00
Advisory Agreement - Incentive Rate, Realized Capital Gains              
Related Party Transaction [Line Items]              
Related party transaction, amounts of transaction         $ 0 0 0
Advisory Agreement - Incentive Rate, Realized Capital Gains | Affiliated Entity              
Related Party Transaction [Line Items]              
Management and service fees, incentive rate         15.00%    
Administrative Agreement - Administrative Fee              
Related Party Transaction [Line Items]              
Related party transaction, amounts of transaction         $ 2,400,000 1,900,000 1,400,000
Mortgage Financing Arrangement Agreement - Financing Fees | Gladstone Securities, LLC              
Related Party Transaction [Line Items]              
Related party transaction, amounts of transaction         $ 100,000 $ 300,000 $ 100,000
Mortgage Financing Arrangement Agreement - Percentage of Mortgage Principal Secured | Gladstone Securities, LLC              
Related Party Transaction [Line Items]              
Related party transaction, rate         0.29% 0.33% 0.33%
Dealer Manager Agreement | Gladstone Securities, LLC              
Related Party Transaction [Line Items]              
Related party transaction, amounts of transaction         $ 500,000 $ 500,000 $ 700,000
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%        
Series F Cumulative Redeemable Preferred Stock | Preferred Stock | Dealer Manager Agreement | Affiliated Entity | Gladstone Securities, LLC              
Related Party Transaction [Line Items]              
Redeemable preferred stock, shares authorized (in shares) | shares     20,000,000        
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        
Minimum | Mortgage Financing Arrangement Agreement - Financing Fees | Gladstone Securities, LLC              
Related Party Transaction [Line Items]              
Related party transaction, rate         0.15%    
Maximum | Mortgage Financing Arrangement Agreement - Financing Fees | Gladstone Securities, LLC              
Related Party Transaction [Line Items]              
Related party transaction, rate         1.00%    
[1] Refer to Note 2 “Related-Party Transactions”