Note 10 - Fair Values of Financial Instruments - Reconciliation for Assets Measured at Fair Value on Recurring Basis Using significant Unobservable Inputs (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| US States and Political Subdivisions Debt Securities [Member] | ||
| Balance | $ 3,604 | $ 4,317 |
| Unrealized gain included in other comprehensive loss | 34 | 68 |
| Maturities, prepayments, and calls | (1,029) | (917) |
| Balance | $ 2,609 | 3,468 |
| Corporate Debt Securities [Member] | ||
| Balance | 494 | |
| Unrealized gain included in other comprehensive loss | 6 | |
| Maturities, prepayments, and calls | (500) | |
| Balance | $ 0 | |