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Note 6 - Other Borrowings (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Line of Credit Facility, Remaining Borrowing Capacity $ 212,400 $ 128,500
Percentage of Assets, Maximum Borrowing Capacity from FHLB 19.00%  
Loans Pledged as Collateral $ 187,000 110,800
Federal Home Loan Bank Stock 776 763
Advances from Federal Home Loan Banks, Total 0 $ 0
FHLB Loans [Member]    
Line of Credit Facility, Remaining Borrowing Capacity 138,900  
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  
Line of Credit [Member] | Unsecured Line of Credit [Member] | Prime Rate [Member]    
Debt Instrument, Basis Spread on Variable Rate 0.25%