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Note 6 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Securities sold under agreements to repurchase $ 167,527,000 $ 102,675,000
Average daily balance during the period 123,486,000 105,234,000
Maximum daily balance during the period $ 167,527,000 $ 133,411,000
Securities Sold under Agreements to Repurchase [Member]    
Average interest rate at end of period 0.10% 0.17%
Average interest rate during the period 0.13% 0.24%