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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Loans Past Due 90 Days or More and Impaired Loans (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Loans past due 90 days or more and still accruing $ 61 [1] $ 259 $ 51 [1]
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees and costs 0.01% 0.04% 0.01%
Accruing restructured loans $ 8,337 $ 3,711 $ 5,134
Impaired loans:      
Impaired loans with no valuation allowance 10,607 [2] 9,320 10,444 [2]
Impaired loans with a valuation allowance 1,435 [2] 880 1,480 [2]
Total impaired loans 12,042 [2] 10,200 11,924 [2]
Valuation allowance (162) (23) (177)
Impaired loans, net of allowance 11,880 10,177 11,747
Average recorded investment in impaired loans(1) [3],[4] 12,326 12,017 13,344 [5]
Interest income recognized on impaired loans, after designation as impaired 239 192 528 [5]
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.