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Note 6 - Other Borrowings (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Line of Credit Facility, Remaining Borrowing Capacity $ 237,900 $ 218,100
Percentage of Assets, Maximum Borrowing Capacity from FHLB 19.00%  
Loans Pledged as Collateral $ 197,300 194,900
Federal Home Loan Bank Stock 818 776
Advances from Federal Home Loan Banks, Total 0 $ 0
FHLB Loans [Member]    
Line of Credit Facility, Remaining Borrowing Capacity 146,700  
Line of Credit [Member] | Unsecured Line of Credit [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 5,000  
Long-term Line of Credit, Total $ 0  
Debt Instrument, Basis Spread on Variable Rate 0.25%  
Debt Instrument, Interest Rate Floor 3.50%