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Note 2 - Investment Securities (Details Textual)
3 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Proceeds from Sale of Debt Securities, Available-for-Sale $ 0 $ 0  
Debt Securities, Available-for-Sale, Excluding Accrued Interest $ 274,887,000   $ 281,692,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 252   241
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest $ 0   $ 0
Asset Pledged as Collateral without Right [Member]      
Debt Securities, Available-for-Sale, Excluding Accrued Interest $ 19,694,000   $ 19,976,000