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Note 19 - Commitments and Contingent Liabilities (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingency Accrual, Ending Balance $ 350    
Operating Leases, Rent Expense, Net, Total 2,000 $ 1,900 $ 1,800
Performance Guarantee [Member]      
Guarantee Obligation, Estimated Payment Under Default on Contract $ 1,600    
Minimum [Member]      
Guarantee Obligations, Agreement Term 30 days    
Maximum [Member]      
Guarantee Obligations, Agreement Term 330 days    
Standby Letters of Credit [Member]      
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 20,900 14,800  
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 $ 834,600 $ 688,300