Note 2 - Investment Securities - Schedule of Held-to-maturity Investment Securities (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | $ 13,790 | $ 13,798 |
| Gross unrealized gains, held-to-maturity | 20 | 32 |
| Gross unrealized losses, held-to-maturity | (111) | (76) |
| Fair value, held-to-maturity | 13,699 | 13,754 |
| Nontaxable Municipal Bonds [Member] | ||
| Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 13,790 | 13,798 |
| Gross unrealized gains, held-to-maturity | 20 | 32 |
| Gross unrealized losses, held-to-maturity | (111) | (76) |
| Fair value, held-to-maturity | $ 13,699 | $ 13,754 |
| X | ||||||||||
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
|
| X | ||||||||||
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
|
| X | ||||||||||
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|