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Note 4 - Loans and Allowance for Loan Losses - TDRs Pre-modification and Post-modification (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
Number of Loans 2 0
Performing Financial Instruments [Member]    
Pre-modification recorded investment $ 1,235  
Post-modification recorded investment 1,235  
Nonperforming Financial Instruments [Member]    
Pre-modification recorded investment  
Post-modification recorded investment  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Reduction of Principal and Interest Payments [Member]    
Number of Loans 1  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Reduction of Principal and Interest Payments [Member] | Performing Financial Instruments [Member]    
Pre-modification recorded investment $ 1,036  
Post-modification recorded investment 1,036  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Reduction of Principal and Interest Payments [Member] | Nonperforming Financial Instruments [Member]    
Pre-modification recorded investment  
Post-modification recorded investment  
Commercial and Industrial Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member]    
Number of Loans 1  
Commercial and Industrial Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member] | Performing Financial Instruments [Member]    
Pre-modification recorded investment $ 199  
Post-modification recorded investment 199  
Commercial and Industrial Portfolio Segment [Member] | Reduction of Principal and Interest Payments [Member] | Nonperforming Financial Instruments [Member]    
Pre-modification recorded investment  
Post-modification recorded investment