Note 4 - Fair Value Measurements (Tables)
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6 Months Ended |
Jun. 30, 2026 |
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| Notes Tables |
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| Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
| | | Fair | | | | | | | | | | | | | |
| | | Value | | | Level 1 | | | Level 2 | | | Level 3 | |
| Senior secured term loans | | $ | 128,864,890 | | | $ | — | | | $ | — | | | $ | 128,864,890 | |
| Senior secured term loan participations | | | 66,297,945 | | | | — | | | | — | | | | 66,297,945 | |
| Senior secured trade finance participations | | | 24,859,079 | | | | — | | | | — | | | | 24,859,079 | |
| Convertible notes | | | 30,806,874 | | | | — | | | | — | | | | 30,806,874 | |
| Other investments | | | 11,816,853 | | | | — | | | | — | | | | 11,816,853 | |
| Equity warrants | | | — | | | | — | | | | — | | | | — | |
| Total | | $ | 262,645,641 | | | $ | — | | | $ | — | | | $ | 262,645,641 | |
| | | Fair | | | | | | | | | | | | | |
| | | Value | | | Level 1 | | | Level 2 | | | Level 3 | |
| Senior secured term loans | | $ | 123,807,284 | | | $ | — | | | $ | — | | | $ | 123,807,284 | |
| Senior secured term loan participations | | | 71,371,727 | | | | — | | | | — | | | | 71,371,727 | |
| Senior secured trade finance participations | | | 26,493,018 | | | | — | | | | — | | | | 26,493,018 | |
| Convertible notes | | | 29,092,471 | | | | — | | | | — | | | | 29,092,471 | |
| Other investments | | | 11,451,817 | | | | — | | | | — | | | | 11,451,817 | |
| Equity warrants | | | — | | | | — | | | | — | | | | — | |
| Total | | $ | 262,216,317 | | | $ | — | | | $ | — | | | $ | 262,216,317 | |
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
| | | Fair Value at December 31, 2025 | | | Purchases | | | Proceeds from disposition and paydowns of investments | | | Reclassifications | | | | Capitalized payment-in-kind interest income | | | Net change in unrealized appreciation (depreciation) | | | Net realized gains (losses) | | | Fair Value at June 30, 2026 | |
| Senior secured term loans | | $ | 123,807,284 | | | $ | — | | | $ | — | | | $ | — | | | | $ | 7,333,443 | | | $ | (2,275,837 | ) | | $ | — | | | $ | 128,864,890 | |
| Senior secured term loan participations | | | 71,371,727 | | | | — | | | | (5,652,998 | ) | | | — | | | | | 732,561 | | | | (153,345 | ) | | | — | | | | 66,297,945 | |
| Senior secured trade finance participations | | | 26,493,018 | | | | — | | | | (60,874 | ) | | | 381,883 | | (1) | | | — | | | | (1,954,948 | ) | | | — | | | | 24,859,079 | |
| Convertible notes | | | 29,092,471 | | | | — | | | | — | | | | — | | | | | 1,714,403 | | | | — | | | | — | | | | 30,806,874 | |
| Other investments | | | 11,451,817 | | | | — | | | | (274,146 | ) | | | — | | | | | — | | | | 639,182 | | | | — | | | | 11,816,853 | |
| Equity warrants | | | — | | | | — | | | | — | | | | — | | | | | — | | | | — | | | | — | | | | — | |
| Total | | $ | 262,216,317 | | | $ | — | | | $ | (5,988,018 | ) | | $ | 381,883 | | | | $ | 9,780,407 | | | $ | (3,744,948 | ) | | $ | — | | | $ | 262,645,641 | |
| | | Fair Value at December 31, 2024 | | | Purchases | | | Proceeds from disposition and paydowns of investments | | | Reclassifications | | | | Capitalized payment-in-kind interest income | | | Net change in unrealized appreciation (depreciation) | | | Net realized gains (losses) | | | Fair Value at December 31, 2025 | |
| Senior secured term loans | | $ | 121,679,322 | | | $ | — | | | $ | — | | | $ | (3,904,117 | ) | (1) | | $ | 14,872,272 | | | $ | (8,840,193 | ) | | $ | — | | | $ | 123,807,284 | |
| Senior secured term loan participations | | | 78,156,693 | | | | — | | | | (6,632,559 | ) | | | — | | | | | 1,852,138 | | | | (2,004,545 | ) | | | — | | | | 71,371,727 | |
| Senior secured trade finance participations | | | 27,665,139 | | | | — | | | | (776,478 | ) | | | — | | | | | — | | | | 5,625,010 | | | | (6,020,653 | ) | | | 26,493,018 | |
| Convertible notes | | | 25,387,189 | | | | — | | | | — | | | | — | | | | | 3,178,475 | | | | 526,807 | | | | — | | | | 29,092,471 | |
| Other investments | | | 13,054,395 | | | | — | | | | (1,326,315 | ) | | | — | | | | | — | | | | (202,392 | ) | | | (73,871 | ) | | | 11,451,817 | |
| Equity warrants | | | 2,466,534 | | | | — | | | | — | | | | — | | | | | — | | | | (2,466,534 | ) | | | — | | | | — | |
| Total | | $ | 268,409,272 | | | $ | — | | | $ | (8,735,352 | ) | | $ | (3,904,117 | ) | | | $ | 19,902,885 | | | $ | (7,361,847 | ) | | $ | (6,094,524 | ) | | $ | 262,216,317 | |
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| Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] |
| | | Fair value | | Valuation technique | | Unobservable input | | Range (weighted average) (4) |
| Senior secured trade finance participations (1) | | $ | 6,310,193 | | Collateral based approach | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 1.65x - 6.45x, 11.75% - 17.67% (15.43%), 1.0 - 3.0 years |
| Senior secured trade finance participations (2) | | $ | 18,548,886 | | Income approach (DCF) | | Discount rate, Estimated duration period (5) | | 15.0% - 21.50% (19.42%), 4.0 - 13.1 years |
| Senior secured term loans (2) | | $ | 114,035,365 | | Income approach (DCF) | | Discount rate, Estimated duration period (5) | | 15.50% - 21.50% (17.93%), 0.8 - 24.5 years |
| Senior secured term loans (3) | | $ | 14,829,525 | | A hybrid of the collateral based or conversion approach and the income approach (DCF) | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 0.60x - 1.18x, 19.0% - 35.0% (23.23%), 1.0 - 6.8 years |
| Senior secured term loan participations (1) | | $ | 21,573,387 | | Collateral based approach | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 0.35x - 2.60x, 13.50% - 19.0% (18.21%), 1.0 - 3.5 years |
| Senior secured term loan participations (2) | | $ | 36,425,260 | | Income approach (DCF) | | Discount rate, EBITDA multiple, Estimated duration period (5) | | 5.03% - 17.0% (11.40%), 7x, 0.1 - 8.0 years |
| Senior secured term loan participations (3) | | $ | 8,299,298 | | A hybrid of the collateral based approach and the income approach (DCF) | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 0.36x - 4.52x, 22.50% - 22.75% (22.55%), 1.5 - 3.2 years |
| Other investments (1) | | $ | 7,872,732 | | Collateral based approach | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 0.53x - 1.02x, 20.0% - 30.0% (26.03%), 0.5 - 3.0 years |
| Other investments (2) | | $ | 3,944,121 | | Income approach (DCF) | | Discount rate, Estimated duration period (5) | | 6.63% - 13.25% (8.10%), 0.5 - 3.5 years |
| Convertible notes (2) | | $ | 30,806,874 | | Income approach (DCF) | | Discount rate, Estimated duration period (5) | | 15.75% - 18.0% (17.95%), 0.5 years |
| Equity warrants | | $ | — | | Option Pricing Method | | Risk free rate, volatility, time to liquidity | | 3.7%, 90.6%, 5 years |
| | | Fair value | | Valuation technique | | Unobservable input | | Range (weighted average) (4) |
| Senior secured trade finance participations (1) | | $ | 6,926,432 | | Collateral based approach | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 1.24x - 1.65x, 11.75% - 17.67% (15.38%), 1.0 - 3.3 years |
| Senior secured trade finance participations (2) | | $ | 19,566,586 | | Income approach (DCF) | | Discount rate, Estimated duration period (5) | | 15.0% - 20.50% (18.80%), 4.0 - 13.6 years |
| Senior secured term loans (2) | | $ | 106,838,273 | | Income approach (DCF) | | Discount rate, Estimated duration period (5) | | 15.50% - 21.0% (19.13%), 0.8 - 25.0 years |
| Senior secured term loans (3) | | $ | 16,969,011 | | A hybrid of the collateral based approach and the income approach (DCF) | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 0.74x - 1.18x, 19.0% - 35.0% (22.79%), 1.0 - 4.0 years |
| Senior secured term loan participations (1) | | $ | 21,129,236 | | Collateral based approach | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 0.37x - 2.73x, 13.50% - 19.0% (18.19%), 1.0 - 3.5 years |
| Senior secured term loan participations (2) | | $ | 48,465,183 | | Income approach (DCF) | | Discount rate, EBITDA multiple, Estimated duration period (5) | | 11.0% - 22.5% (14.48%), 7x, 0.2 - 8.5 years |
| Senior secured term loan participations (3) | | $ | 1,777,308 | | A hybrid of the collateral based approach and the income approach (DCF) | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 0.37x, 22.75%, 2.9 - 3.0 years |
| Other investments (1) | | $ | 8,637,158 | | Collateral based approach | | Value of collateral (collateral coverage ratio), Discount rate, Estimated duration period (5) | | 0.53x - 1.32x, 5.18% - 30.0% (24.19%), 0.5 - 4.0 years |
| Other investments (2) | | $ | 2,814,659 | | Income approach (DCF) | | Discount rate, Estimated duration period (5) | | 8.0% - 13.25% (9.23%), 0.5 - 2.0 years |
| Convertible notes (2) | | $ | 29,092,471 | | Income approach (DCF) | | Discount rate | | 15.75% - 17.0% (16.97%) |
| Equity warrants | | $ | — | | Option Pricing Method | | Risk free rate, volatility, time to liquidity | | 3.7%, 90.6%, 5 years |
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