v3.26.1
FINANCIAL HIGHLIGHTS SCHEDULE - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investment Company, Financial Highlights [Line Items]          
Net asset value, beginning of year [1] $ 25.31 $ 23.56 $ 22.36 $ 23.54 $ 17.86
Net investment income (loss) [1] 1.78 1.33 1.15 1.72 (1.01)
Net (decrease) increase in net assets from operations [1] (2.71) 3.42 2.53 (0.34) 6.12
Effect of the stock dividend [1] (3.31) 0 0 0 0
Declaration of cash dividend [1] (1.72) (1.67) (1.33) (0.83) (0.44)
(Decrease) increase in net assets [1] (7.74) 1.75 1.2 (1.18) 5.68
Net asset value, end of year [1] 17.57 25.31 23.56 22.36 23.54
Per share market value, end of year [1] $ 11.36 $ 19.25 $ 12.99 $ 13.32 $ 16.99
Total return based on market value [2] (33.54%) 88.58% 7.26% (16.99%) 6.51%
Total return based on net asset value [3] (23.79%) 28.78% 11.31% (1.45%) 34.28%
Supplemental data:          
Net assets, end of period $ 52,183,453 $ 65,332,520 $ 60,815,213 $ 57,721,320 $ 60,745,416
Ratio of expenses before income taxes to average net assets 2.02% 7.67% 7.05% 1.89% 12.49%
Ratio of expenses including taxes to average net assets 2.02% 7.60% 10.88% 2.25% 12.11%
Ratio of net investment income (loss) to average net assets 9.00% 5.43% 5.01% 7.48% (4.88%)
Portfolio turnover 11.00% 18.90% 29.40% 11.20% 37.80%
Total amount of senior securities outstanding, exclusive of treasury securities $ 0 $ 600,000 $ 16,250,000 $ 2,550,000  
Asset coverage per unit [4]   10988.80% 474.20% 2363.60%  
Net Realized (Losses) gains          
Investment Company, Financial Highlights [Line Items]          
Net realized (losses) gains and Net change in unrealized appreciation (depreciation) [1] $ (0.67) $ 4.31 $ 0.27 $ 0.27 $ 2.26
Net Change in Unrealized (Depreciation) Appreciation          
Investment Company, Financial Highlights [Line Items]          
Net realized (losses) gains and Net change in unrealized appreciation (depreciation) [1] $ (3.81) $ (2.22) $ 1.11 $ (2.33) $ 4.87
[1] Per share data are based on shares outstanding and results are rounded.
[2] Total return based on market value is calculated as the change in market value per share during the period plus declared dividends per share, assuming reinvestment of dividends, divided by the beginning market value per share
[3] Total return based on net asset value is calculated as the change in net asset value per share during the period plus declared dividends per share, divided by the beginning net asset value per share.
[4] Asset coverage per unit is the ratio of the carrying value of the Corporation’s total consolidated assets, less liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness.