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Selected Quarterly Data - Summary of Selected Quarterly Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
 [2]
Dec. 31, 2018
 [2]
Quarterly Financial Data [Abstract]                          
Total interest and related portfolio income $ 18,617 $ 19,009 $ 15,044 $ 16,944 $ 17,325 $ 22,911 $ 21,545 $ 18,305          
Net investment income 7,068 8,392 5,522 7,908 8,363 13,718 11,711 8,213 $ 28,890 $ 42,004 $ 17,000    
Net increase (decrease) in net assets resulting from operations $ (12,416) $ (4,205) $ (8,433) $ 4,058 $ (2,000) $ 9,144 $ 10,844 $ 8,037 $ (20,996) $ 26,026 $ 31,573    
Net increase (decrease) in net assets resulting from operations per share - basic $ (1.28) $ (0.44) $ (0.88) $ 0.42 $ (0.21) $ 1.00 $ 1.40 $ 1.07 $ (2.18) [1],[2] $ 3.05 [1],[2] $ 6.32 [1],[2] $ (3.34) $ (2.56)
Net increase (decrease) in net assets resulting from operations per share - diluted (1.28) (0.44) (0.88) 0.42 (0.21) 1.00 1.40 1.07 (2.18) [1] 3.05 [1] 6.32 [1]    
Net investment income per share - basic and diluted $ 0.74 $ 0.87 $ 0.57 $ 0.82 $ 0.88 $ 1.50 $ 1.51 $ 1.09 $ 3.00 [1] $ 4.92 [1] $ 3.40 [1]    
[1] The Company completed a Reverse Stock Split of 10 to 1 effective August 26, 2021, the weighted average shares outstanding and per share values have been adjusted retroactively to reflect the split for all periods presented.
[2] Totals may not sum due to rounding.