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Note 6 - Allowance for Loan Losses (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
[1]
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Loans and Leases Receivable, Allowance, Ending Balance $ 27,277 $ 23,758 $ 18,425 $ 18,493 $ 18,540 $ 18,267
Financial Asset Acquired with Credit Deterioration [Member]            
Loans and Leases Receivable, Allowance, Ending Balance $ 0          
[1] Derived from audited financial statements