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Note 8 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Securities sold under agreements to repurchase $ 194,340,000 $ 197,463,000
Average daily balance during the year 200,499,000 158,855,000
Maximum daily balance during the year $ 235,577,000 $ 209,093,000
Securities Sold under Agreements to Repurchase [Member]    
Weighted average interest rate at year-end 0.75% 0.11%
Weighted average interest rate during the year 0.15% 0.11%