Note 6 - Investment Securities (Details Textual) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
|
| Investment Securities [Line Items] | |||
| Proceeds from sale of investment securities | $ 0 | $ 0 | |
| Available-for-sale securities pledged as collateral | $ 226,967,000 | $ 234,159,000 | |
| Debt Securities, Available-for-Sale, Restriction Type [Extensible Enumeration] | us-gaap:AssetPledgedAsCollateralMember | us-gaap:AssetPledgedAsCollateralMember | |
| Other than temporary impairment charges recognized for debt securities | $ 0 | 0 | |
| Debt Securities [Member] | |||
| Investment Securities [Line Items] | |||
| Income tax expense (benefit) related to net realized gains (losses) on sales of securities | $ 0 | $ 0 | |