Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions (Details)

v3.23.2
Related-Party Transactions (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 11, 2023
Jul. 14, 2020
Feb. 20, 2020
$ / shares
shares
Feb. 29, 2020
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
quarter
officer
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Related Party Transaction [Line Items]                  
Number of executive officers | officer             2    
Base management fee [1]         $ 1,605,000 $ 1,577,000 $ 3,210,000 $ 3,124,000  
Related Party                  
Related Party Transaction [Line Items]                  
Amount due to advisor and administrator [2]         $ 2,624,000   $ 2,624,000   $ 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   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         $ 1,600,000 1,600,000 $ 3,200,000 3,100,000  
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 | Subsequent Event                  
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           1,300,000   2,700,000  
Contractual fee waived         1,400,000   $ 2,500,000    
Investment company, voluntary fee waived           0   0  
Advisory Agreement - Incentive Rate, Realized Capital Gains                  
Related Party Transaction [Line Items]                  
Related party transaction, amounts of transaction         0 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%    
Advisory Agreement - Termination Fee Payable as a Percentage of Management and Incentive Fees Earned by Adviser | Affiliated Entity                  
Related Party Transaction [Line Items]                  
Related party transaction, rate             200.00%    
Administrative Agreement - Administrative Fee                  
Related Party Transaction [Line Items]                  
Related party transaction, amounts of transaction         500,000 400,000 $ 1,100,000 900,000  
Mortgage Financing Arrangement Agreement - Financing Fees | Gladstone Securities, LLC                  
Related Party Transaction [Line Items]                  
Related party transaction, amounts of transaction         $ 17,500 $ 100,000 $ 17,500 $ 100,000  
Mortgage Financing Arrangement Agreement - Percentage of Mortgage Principal Secured | Gladstone Securities, LLC                  
Related Party Transaction [Line Items]                  
Related party transaction, rate         0.20% 0.35% 0.20% 0.35%  
Dealer Manager Agreement | Gladstone Securities, LLC                  
Related Party Transaction [Line Items]                  
Related party transaction, amounts of transaction         $ 300,000 $ 100,000 $ 400,000 $ 300,000  
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            
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            
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”
[2] Refer to Note 2 “Related-Party Transactions”