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Note 19 - Commitments and Contingent Liabilities (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loss Contingency Accrual $ 350    
Operating Leases, Rent Expense, Net 1,900 $ 1,800 $ 1,700
Performance Guarantee [Member]      
Guarantee Obligation, Estimated Payment Under Default on Contract $ 1,500    
Minimum [Member]      
Guarantee Obligations, Agreement Term 30 days    
Maximum [Member]      
Guarantee Obligations, Agreement Term 1 year 210 days    
Standby Letters of Credit [Member]      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 14,800 15,600  
Standby Letters of Credit [Member] | Minimum [Member]      
Guarantee Obligations, Agreement Term 1 year    
Standby Letters of Credit [Member] | Maximum [Member]      
Guarantee Obligations, Agreement Term 2 years    
Commitments to Extend Credit and Standby Letters of Credit [Member]      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 688,300 $ 628,300