Note 6 - Fair Value Measurements (Tables)
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6 Months Ended |
Jun. 30, 2026 |
| Notes Tables |
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| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
| | | | | | | | | | | | | | | | | |
| | | | | | | Quoted Prices | | | Significant | | | | | |
| | | | | | | in Active | | | Other | | | Significant | |
| | | | | | | Markets for | | | Observable | | | Unobservable | |
| (in thousands) | | | | | | Identical Assets | | | Inputs | | | Inputs | |
| June 30, 2026 | | Fair Value | | | (Level 1) | | | (Level 2) | | | (Level 3) | |
| U.S. Treasury securities | | $ | 87,649 | | | $ | 87,649 | | | $ | — | | | $ | — | |
| Securities of U.S. government agencies and corporations | | | 89,601 | | | | — | | | | 89,601 | | | | — | |
| Obligations of states and political subdivisions | | | 73,908 | | | | — | | | | 73,908 | | | | — | |
| Collateralized mortgage obligations | | | 96,060 | | | | — | | | | 96,060 | | | | — | |
| Mortgage-backed securities | | | 271,713 | | | | — | | | | 271,713 | | | | — | |
| Total investments at fair value | | $ | 618,931 | | | $ | 87,649 | | | $ | 531,282 | | | $ | — | |
| | | | | | | | | | | | | | | | | |
| | | | | | | Quoted Prices | | | Significant | | | | | |
| | | | | | | in Active | | | Other | | | Significant | |
| | | | | | | Markets for | | | Observable | | | Unobservable | |
| (in thousands) | | | | | | Identical Assets | | | Inputs | | | Inputs | |
| December 31, 2025 | | Fair Value | | | (Level 1) | | | (Level 2) | | | (Level 3) | |
| U.S. Treasury securities | | $ | 87,556 | | | $ | 87,556 | | | $ | — | | | $ | — | |
| Securities of U.S. government agencies and corporations | | | 85,344 | | | | — | | | | 85,344 | | | | — | |
| Obligations of states and political subdivisions | | | 75,003 | | | | — | | | | 75,003 | | | | — | |
| Collateralized mortgage obligations | | | 92,284 | | | | — | | | | 92,284 | | | | — | |
| Mortgage-backed securities | | | 277,056 | | | | — | | | | 277,056 | | | | — | |
| Total investments at fair value | | $ | 617,243 | | | $ | 87,556 | | | $ | 529,687 | | | $ | — | |
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| Fair Value Measurements, Nonrecurring [Table Text Block] |
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| (in thousands) | | Carrying | | | | | | | | | | | | | |
| June 30, 2026 | | Value | | | Level 1 | | | Level 2 | | | Level 3 | |
| Collateral dependent loans | | $ | 795 | | | $ | — | | | $ | — | | | $ | 795 | |
| Total assets at fair value | | $ | 795 | | | $ | — | | | $ | — | | | $ | 795 | |
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| (in thousands) | | Carrying | | | | | | | | | | | | | |
| December 31, 2025 | | Value | | | Level 1 | | | Level 2 | | | Level 3 | |
| Collateral dependent loans | | $ | 835 | | | $ | — | | | $ | — | | | $ | 835 | |
| Total assets at fair value | | $ | 835 | | | $ | — | | | $ | — | | | $ | 835 | |
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| Fair Value, by Balance Sheet Grouping [Table Text Block] |
| | | | | | | June 30, 2026 | | | December 31, 2025 | |
| | | | | | | Carrying | | | Fair | | | Carrying | | | Fair | |
| | | Level | | | amount | | | value | | | amount | | | value | |
| (in thousands) | | | | | | | | | | | | | | | | | | | | |
| Financial assets: | | | | | | | | | | | | | | | | | | | | |
| Cash and cash equivalents | | | 1 | | | $ | 113,435 | | | $ | 113,435 | | | $ | 145,554 | | | $ | 145,554 | |
| Certificates of deposit | | | 2 | | | | 10,863 | | | | 10,871 | | | | 10,180 | | | | 10,243 | |
| Stock in Federal Home Loan Bank and other equity securities | | | 3 | | | | 10,871 | | | | 10,871 | | | | 10,871 | | | | 10,871 | |
| Loans receivable: | | | | | | | | | | | | | | | | | | | | |
| Net loans | | | 3 | | | | 1,092,098 | | | | 1,027,489 | | | | 1,050,473 | | | | 990,239 | |
| Interest receivable | | | 2 | | | | 8,057 | | | | 8,057 | | | | 7,348 | | | | 7,348 | |
| Mortgage servicing rights | | | 3 | | | | 1,101 | | | | 1,840 | | | | 1,159 | | | | 1,748 | |
| Financial liabilities: | | | | | | | | | | | | | | | | | | | | |
| Time deposits | | | 3 | | | | 137,200 | | | | 137,130 | | | | 141,661 | | | | 141,713 | |
| Interest payable | | | 2 | | | | 580 | | | | 580 | | | | 724 | | | | 724 | |
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