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Note 4 - Loans and Allowance for Loan Losses (Details) - Loans Restructured as TDRs, Excluding Loans Acquired, Segregated by Class of Loans
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Consumer:    
Number of loans 18 3
Balance Prior to TDR $ 2,636 $ 2,025
Balance 2,545 1,427
Extended Maturity [Member]    
Consumer:    
Modification type 2,545 396
Interest Rate Below Market Reduction [Member]    
Consumer:    
Modification type $ 0 $ 1,031
Consumer Portfolio Segment [Member]    
Consumer:    
Number of loans 1  
Balance Prior to TDR $ 13  
Balance 13  
Consumer Portfolio Segment [Member] | Extended Maturity [Member]    
Consumer:    
Modification type 13  
Consumer Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Consumer:    
Modification type $ 0  
Consumer Portfolio Segment [Member] | Other Loans [Member]    
Consumer:    
Number of loans 1  
Balance Prior to TDR $ 13  
Balance 13  
Consumer Portfolio Segment [Member] | Other Loans [Member] | Extended Maturity [Member]    
Consumer:    
Modification type 13  
Consumer Portfolio Segment [Member] | Other Loans [Member] | Interest Rate Below Market Reduction [Member]    
Consumer:    
Modification type $ 0  
Commercial Real Estate Portfolio Segment [Member]    
Consumer:    
Number of loans 12 2
Balance Prior to TDR $ 2,276 $ 1,427
Balance 2,200 1,427
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member]    
Consumer:    
Modification type 2,200 396
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Consumer:    
Modification type $ 0 $ 1,031
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]    
Consumer:    
Number of loans 11  
Balance Prior to TDR $ 1,179  
Balance 1,103  
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Extended Maturity [Member]    
Consumer:    
Modification type $ 1,103  
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]    
Consumer:    
Number of loans 1 2
Balance Prior to TDR $ 1,097 $ 1,427
Balance 1,097 1,427
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Extended Maturity [Member]    
Consumer:    
Modification type 1,097 396
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Interest Rate Below Market Reduction [Member]    
Consumer:    
Modification type $ 0 $ 1,031
Commercial Portfolio Segment [Member]    
Consumer:    
Number of loans 5 1
Balance Prior to TDR $ 347 $ 598
Balance 332 0
Commercial Portfolio Segment [Member] | Extended Maturity [Member]    
Consumer:    
Modification type 332 0
Commercial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Consumer:    
Modification type $ 0 $ 0
Commercial Portfolio Segment [Member] | Commercial Loans [Member]    
Consumer:    
Number of loans 5 1
Balance Prior to TDR $ 347 $ 598
Balance 332 0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Extended Maturity [Member]    
Consumer:    
Modification type 332 0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Interest Rate Below Market Reduction [Member]    
Consumer:    
Modification type $ 0 $ 0