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Note 13 - Financial Instruments With Off-balance Sheet Risk (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Payments for Origination of Mortgage Loans Held-for-sale $ 21,032 $ 12,626 $ 13,912
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Cost of Mortgage Sold $ 20,496 13,013  
Potential Default Period After Sale of Loans to Investor 1 year    
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance $ 905 $ 72  
Cash, Uninsured Amount 14    
Interest Rate Lock Commitments [Member]      
Other Commitment, Total $ 817