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Note 7 - Available-for-Sale Securities (Details Textual) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 USD ($) AvailableForSaleSecurity | Mar. 31, 2025 USD ($) | Dec. 31, 2025 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |
Credit allowance | $ 0 |  | $ 0
Accrued interest receivable on available-for-sale securities | $ 100,000 |  | 100,000
Available-for-sale securities, that were in a gross unrealized loss position for less than 12 months | AvailableForSaleSecurity | 113 |  |
Available-for-sale securities that were in a gross unrealized loss position for less than 12 months, fair value | $ 177,100,000 |  |
Available-for-sale securities, fair value | $ 216,957,000 |  | $ 114,108,000
Available-for-sale securities, that were in a gross unrealized loss position for than 12 months or more | AvailableForSaleSecurity | 0 |  |
Available-for sale securities, accrued interest writeoff | $ 0 | $ 0 |
Available-for-sale securities, realized gains or losses | $ 0 | $ 0 |

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