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Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Loans Past Due 90 Days or More and Impaired Loans - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loans Past Due 90 Days or More and Impaired Loans [Abstract]      
Loans past due 90 days or more and still accruing $ 156 $ 207  
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees 0.03% 0.03%  
Accruing restructured loans $ 8,814 $ 6,040  
Impaired loans:      
Impaired loans with no valuation allowance [1] 12,973 7,615  
Impaired loans with a valuation allowance [1] 2,373 7,506  
Total impaired loans [1] 15,346 15,121  
Valuation allowance (45) (282)  
Impaired loans, net of allowance 15,301 14,839  
Average recorded investment in impaired loans(1) [1],[2] 17,297 16,311 $ 16,654
Income recognized on impaired loans, after designation as impaired [2] $ 769 $ 473 $ 267
[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[2] Only classes with impaired loans are shown.