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Note 6 - Allowance for Loan Losses (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable, Allowance, Ending Balance $ 18,267 $ 19,276 [1] $ 17,948
Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable, Allowance, Ending Balance $ 0 $ 0 $ 12
[1] Derived from audited financial statements