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Note 6 - Allowance for Loan Losses (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
[1]
Mar. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable, Allowance, Ending Balance $ 21,137 $ 18,425 $ 18,243 $ 18,267
Financial Asset Acquired with Credit Deterioration [Member]        
Loans and Leases Receivable, Allowance, Ending Balance $ 0      
[1] Derived from audited financial statements