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Note 3 - Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Time deposits | $ 210,728,000 |
Reported Value Measurement [Member] |  |
Loans, net | 1,495,834,000 | $ 1,005,375,000
Time deposits | 210,729,000 | 94,189,000
Repurchase agreements | 97,855,000 | 22,073,000
Borrowings | 21,013,000 | 15,000,000
Estimate of Fair Value Measurement [Member] |  |
Loans, net | 1,494,830,000 | 981,114,000
Time deposits | 209,147,000 | 94,161,000
Repurchase agreements | 97,855,000 | 22,073,000
Borrowings | 20,599,000 | 13,967,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Loans, net | 0 | 0
Time deposits | 0 | 0
Repurchase agreements | 0 | 0
Borrowings | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Loans, net | 0 | 0
Time deposits | 209,147,000 | 94,161,000
Repurchase agreements | 97,855,000 | 22,073,000
Borrowings | 20,599,000 | 13,967,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Loans, net | 1,494,830,000 | 981,114,000
Time deposits | 0 | 0
Repurchase agreements | 0 | 0
Borrowings | $ 0 | $ 0

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