Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions (Details)

v3.24.1.u1
Related-Party Transactions (Details)
 3 Months Ended
Jul. 11, 2023
Jul. 14, 2020
Feb. 20, 2020
$ / shares
shares
Mar. 31, 2024
USD ($)
quarter
officer
Mar. 31, 2023
USD ($)
Dec. 31, 2023
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]       $ 2,922,000   $ 2,556,000
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       $ 1,500,000 $ 1,600,000  
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       $ 1,200,000    
Investment company, voluntary fee waived       800,000    
Contractual fee waived         1,100,000  
Advisory Agreement - Incentive Rate, Realized Capital Gains            
Related Party Transaction [Line Items]            
Related party transaction, amounts of transaction       $ 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       $ 600,000 600,000  
Mortgage Financing Arrangement Agreement - Financing Fees | Gladstone Securities, LLC            
Related Party Transaction [Line Items]            
Related party transaction, amounts of transaction       0 0  
Dealer Manager Agreement | Gladstone Securities, LLC            
Related Party Transaction [Line Items]            
Related party transaction, amounts of transaction       $ 20,000.00 $ 30,000.00  
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%      
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”