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Note 3 - Investment Securities (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Proceeds from Sale of Held-to-maturity Securities $ 0 $ 1,766,000 $ 0  
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) 0 0    
Security Owned and Pledged as Collateral, Fair Value, Total $ 60,217,000 $ 60,217,000   $ 178,978,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total 87 87    
Depreciated Debt Securities With Unrealized Losses 0.59% 0.59%    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total   $ 0