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Note 6 - Other Long-term Debt - Summary of Other Long-term Debt (Details) - USD ($) | Mar. 31, 2026 | Dec. 31, 2025 | Jan. 31, 2022
--- | --- | --- | ---
Principal amount | $ 45,155,000 | $ 45,155,000 |
Unamortized debt issuance costs | (676,000) | (705,000) |
3.50% Subordinated Notes Due in 2032 [Member] |  |  |
Principal amount | 40,000,000 | 40,000,000 | $ 40,000,000
Unamortized debt issuance costs | (676,000) | (705,000) |
Variable Interest Rate Subordinated Debentures Due in 2035 [Member] |  |  |
Principal amount | 5,155,000 | 5,155,000 |
Unamortized debt issuance costs | $ 0 | $ 0 |

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