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Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Loans Past Due 90 Days or More and Impaired Loans (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Loans past due 90 days or more and still accruing $ 195,000 [1] $ 47,000 $ 156,000
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees 0.03% 0.01% 0.03%
Accruing restructured loans $ 4,662,000 $ 6,080,000 $ 8,814,000
Impaired loans:      
Impaired loans with no valuation allowance 9,290,000 [2] 12,548,000 12,973,000 [2]
Impaired loans with a valuation allowance 620,000 [2] 2,464,000 2,373,000 [2]
Total impaired loans 9,910,000 [2] 15,012,000 15,346,000 [2]
Valuation allowance (27,000) (144,000) (45,000)
Impaired loans, net of allowance 9,883,000 14,868,000 15,301,000
Average recorded investment in impaired loans(1) [3],[4] 12,908,000 15,902,000 [5] 17,297,000
Interest income recognized on impaired loans, after designation as impaired 476,000 267,000 [5] 769,000
Amount of income recognized on a cash basis $ 0 $ 0 $ 0
[1] Only classes with past-due or nonaccrual loans are shown.
[2] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[3] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[4] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[5] Only classes with impaired loans are shown.