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Consolidated Balance Sheets (Parenthetical)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 26, 2021
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Jun. 23, 2021
USD ($)
Cost/Amortized Cost   $ 630,191   $ 630,191   $ 605,365  
Common stock, par value | $ / shares   $ 0.01   $ 0.01   $ 0.01  
Common stock, authorized | shares   20,000,000   20,000,000   20,000,000  
Common stock, issued | shares   9,906,833   9,906,833   9,867,998  
Common stock, outstanding | shares   9,608,913 [1],[2],[3] 9,123,275 [1],[2],[3] 9,608,913 [1],[2],[3] 9,123,275 [1],[2],[3] 9,699,695  
Derivative liabilities, cost           $ 31  
Reverse stock split 0.10 0.10 0.10 0.10 0.10 0.10  
Non-controlled/Non-affiliated Investments              
Cost/Amortized Cost   $ 510,533   $ 510,533   $ 479,153  
Non-controlled Affiliated Investments              
Cost/Amortized Cost   61,336   61,336   74,082  
Controlled Affiliated Investments              
Cost/Amortized Cost   58,322   58,322   52,130  
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility              
Deferred financing costs, net   1,163   1,163   732  
2018-2 Secured Notes              
Debt instruments, net of discount   1,270   1,270   1,403  
4.875% Notes Due 2026              
Debt instruments, net of discount   1,819   1,819   2,157 $ 2,430
Deferred financing costs, net   $ 880   $ 880   $ 951  
[1] Refer to Note 9 "Stockholders' Equity" for additional information on changes in components of Stockholders' Equity
[2] The Company completed a Reverse Stock Split of 10 to 1 effective August 26, 2021, the common shares and net asset value per common share have been adjusted retroactively to reflect the split for all periods presented.
[3] Totals may not sum due to rounding.