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Note 4 - Loans and Allowance for Loan Losses - TDRs Pre-modification and Post-modification (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
Jun. 30, 2019
USD ($)
Jun. 30, 2018
Number of Loans 2 0 2 0
Performing Financial Instruments [Member]        
Pre-modification recorded investment $ 574   $ 574  
Post-modification recorded investment 574   574  
Nonperforming Financial Instruments [Member]        
Pre-modification recorded investment    
Post-modification recorded investment    
Residential Portfolio Segment [Member]        
Number of Loans 1   1  
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]        
Pre-modification recorded investment $ 292   $ 292  
Post-modification recorded investment 292   292  
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Interest Only Payments [Member]        
Pre-modification recorded investment    
Post-modification recorded investment    
Commercial and Industrial Portfolio Segment [Member]        
Number of Loans 1   1  
Commercial and Industrial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]        
Pre-modification recorded investment $ 282   $ 282  
Post-modification recorded investment 282   282  
Commercial and Industrial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Interest Only Payments [Member]        
Pre-modification recorded investment    
Post-modification recorded investment