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Note 7 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Securities sold under agreements to repurchase $ 121,521 $ 229,734
Average daily balance during the year 224,878 204,334
Maximum daily balance during the year $ 278,227 $ 269,324
Securities Sold under Agreements to Repurchase [Member]    
Weighted average interest rate at year end 2.17% 3.17%
Weighted average interest rate during the year 3.43% 1.33%