Note 8 - Investment Transactions - Schedule of Investments (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Purchase of investment securities | $ (0) | $ 2,441 | $ (0) | $ 2,441 |
| Proceeds from sales and maturities of investment securities | $ 0 | $ 6,112,667 | $ 0 | $ 6,232,667 |