Quarterly report pursuant to Section 13 or 15(d)

RELATED-PARTY TRANSACTIONS - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details)

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RELATED-PARTY TRANSACTIONS - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2018
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]              
Base management fee   $ 1,748 $ 1,078   $ 4,494 $ 3,159  
Incentive fee   945 821   2,107 2,155  
Total fees to our Adviser, net   2,693 1,899   6,601 5,314  
Administration fee   412 344   1,115 1,084  
Selling commissions and dealer-manager fees   1,213 598   3,165 3,368  
Financing fees   12 7   64 30  
Total fees to Gladstone Securities   $ 1,225 $ 605   $ 3,229 $ 3,398  
Series B Preferred Stock              
Related Party Transaction [Line Items]              
Preferred stock, par value (in dollars per share)   $ 0.001     $ 0.001   $ 0.001
Series B Preferred Stock | Preferred Stock              
Related Party Transaction [Line Items]              
Dividend rate 6.00%            
Preferred stock, par value (in dollars per share) $ 0.001            
Series B Preferred Stock | Gladstone Securities | Preferred Stock              
Related Party Transaction [Line Items]              
Selling commissions and dealer-manager fees       $ 2,500