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Financial Highlights - Schedule of Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investment Company, Financial Highlights [Line Items]                    
Net asset value at beginning of period $ 19.96 $ 16.81 $ 16.85 $ 16.47 $ 16.05 $ 15.76 $ 15.17 $ 15.16 $ 15.35 $ 15.32
Net investment income 1.90 1.03 1.62 1.31 1.43 1.44 1.45 1.64 1.62 1.43
Net realized gain (loss) on investments, net of tax (provision) 2.61 2.19 (0.06) (0.05) (0.45) 0.67 (0.77) 0.58 (1.18) 2.22
Taxes paid on deemed distributions (0.35)                 (0.21)
Net unrealized appreciation (depreciation) on investments (2.69) 1.70 (0.27) 0.74 1.05 (0.23) 1.59 (0.62) 0.92 (1.64)
Realized losses on extinguishment of debt (0.01) (0.17) (0.01) (0.02) (0.01) (0.01)        
Total increase from investment operations 1.46 4.75 1.28 1.98 2.02 1.87 2.27 1.60 1.36 2.01
Accretive (dilutive) effect of share issuances and repurchases 0.02   0.01   0.01 0.02 (0.05) 0.02 0.19 0.18
Dividends declared to stockholders (1.19) (1.60) (1.33) (1.60) (1.60) (1.60) (1.60) (1.60) (0.97) (1.21)
Distributions from capital gains (0.81)               (0.75) (0.73)
Other (0.01)       (0.01)   (0.03) (0.01) (0.02) (0.01)
Net asset value at end of period 19.43 19.96 16.81 16.85 16.47 16.05 15.76 15.17 15.16 15.35
Market value at end of period $ 19.03 $ 17.98 $ 13.10 $ 14.84 $ 11.69 $ 15.18 $ 15.73 $ 13.69 $ 14.85 $ 21.74
Shares outstanding at end of period 24,727,788 24,437,400 24,437,400 24,463,119 24,463,119 24,507,940 22,446,076 16,300,732 16,051,037 13,755,232
Weighted average number of shares outstanding - basic 24,468,172 24,437,400 24,442,431              
Weighted average number of shares outstanding - diluted 24,468,172 24,437,400 24,442,431 24,463,119 24,471,730 23,527,188 18,283,715 16,201,449 14,346,438 13,524,368
Net assets at end of period $ 480,343 $ 487,764 $ 410,760 $ 412,310 $ 402,985 $ 393,273 $ 353,785 $ 247,362 $ 243,263 $ 211,125
Average net assets $ 482,594 $ 437,690 $ 392,866 $ 404,284 $ 398,440 $ 376,292 $ 289,453 $ 245,706 $ 222,737 $ 209,136
Total expenses 12.00% 15.40% 11.80% 11.20% 10.70% 9.80% 11.70% 11.30% 10.30% 11.00%
Net investment income 9.60% 5.70% 10.10% 7.90% 8.80% 9.00% 9.20% 10.80% 10.50% 9.20%
Total return based on market value           3.20% 23.80% 2.40% (23.80%) 44.00%
Total return based on market value 17.70% 53.90% 1.00% 37.60% (15.80%)          
Total return based on net asset value 7.30% 28.30% 7.60% 12.00% 12.60% 11.90% 15.00% 10.60% 8.90% 13.10%
Portfolio turnover ratio           29.50% 29.30% 22.50% 18.90% 44.90%
Portfolio turnover ratio 23.90% 47.70% 25.80% 17.20% 29.50%          
Average debt outstanding $ 397,244 $ 380,997 $ 385,350 $ 319,050 $ 271,560 $ 219,920 $ 221,200 $ 199,340 $ 152,700 $ 144,500
Average debt per share $ 16.24 $ 15.59 $ 15.77 $ 13.04 $ 11.10 $ 9.35 $ 12.10 $ 12.30 $ 10.64 $ 10.68