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Note 8 - Loans - Aging of Troubled Debt Restructurings (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Loans current and past due less than 30 days $ 810,195 $ 794,938
Nonaccrual loans 13,113 13,404
Financing Receivables 30 to 89 Days Past Due [Member]    
Loans past due 8,308 10,190
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due 9,060 10,585
Troubled Debt Restructuring [Member]    
Loans current and past due less than 30 days 612 636
Nonaccrual loans 2,884 3,027
Troubled debt restructurings 3,539 3,663
Troubled Debt Restructuring [Member] | Financing Receivables 30 to 89 Days Past Due [Member]    
Loans past due 43 0
Troubled Debt Restructuring [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due $ 0 $ 0