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Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Loans Past Due 90 Days or More and Impaired Loans - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Loans Past Due 90 Days or More and Impaired Loans [Abstract]      
Loans past due 90 days or more and still accruing $ 47 [1] $ 485 $ 207 [1]
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees 0.01% 0.08% 0.03%
Accruing restructured loans $ 6,080 $ 5,947 $ 6,040
Impaired loans:      
Impaired loans with no valuation allowance 12,548 [2],[3] 9,223 7,615 [2],[3]
Impaired loans with a valuation allowance 2,464 [2],[3] 5,964 7,506 [2],[3]
Total impaired loans 15,012 [2],[3] 15,187 15,121 [2],[3]
Valuation allowance (144) [2] (296) (282) [2]
Impaired loans, net of allowance 14,868 14,891 14,839
Average recorded investment in impaired loans(1) [2],[3] 15,902 15,974 16,311
Interest income recognized on impaired loans, after designation as impaired [2] $ 267 $ 384 $ 473
[1] Only classes with past-due or nonaccrual loans are shown.
[2] Only classes with impaired loans are shown.
[3] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.