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Note 2 - Investment Securities (Details Textual)
$ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Held-to-Maturity, Number of Securities 0  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss $ 0  
Debt Securities, Held-to-Maturity, Nonaccrual 0 $ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 4,000  
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss   $ 6,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 465 498
Debt Securities, Available-for-Sale, Unrealized Loss Position, Percentage 97.00% 98.00%
Collateral Pledged [Member]    
Debt Securities, Available-for-Sale, Restricted $ 834,000 $ 991,000