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Note 5 - Allowance for Loan Losses (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable, Allowance, Ending Balance $ 19,500 $ 19,276 [1] $ 18,458 $ 17,948
Loans Deemed to be Impaired, Threshold 500 $ 250    
Financial Asset Acquired with Credit Deterioration [Member]        
Loans and Leases Receivable, Allowance, Ending Balance $ 0   $ 12 $ 12
[1] Derived from audited financial statements