Quarterly report [Sections 13 or 15(d)]

Related Party Transactions (Details)

v3.26.1
Related Party Transactions (Details)
 3 Months Ended
Jul. 11, 2023
Feb. 20, 2020
$ / shares
shares
Mar. 31, 2026
USD ($)
quarter
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
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     $ 1,700,000 $ 1,600,000  
Advisory Agreement - Incentive Rate, Realized Capital Gains          
Related Party Transaction [Line Items]          
Related party transaction, amounts of transaction     0 0  
Administrative Agreement - Administrative Fee          
Related Party Transaction [Line Items]          
Related party transaction, amounts of transaction     700,000 600,000  
Mortgage Financing Arrangement Agreement - Financing Fees | Gladstone Securities, LLC          
Related Party Transaction [Line Items]          
Related party transaction, amounts of transaction     $ 0 0  
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%    
Dealer Manager Agreement | Gladstone Securities, LLC          
Related Party Transaction [Line Items]          
Related party transaction, amounts of transaction     $ 0 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%      
Related Party          
Related Party Transaction [Line Items]          
Amount due to advisor and administrator [1]     $ 2,856,000   $ 3,223,000
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    
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     $ 600,000 600,000  
Investment company, voluntary fee waived     $ 600,000 $ 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”