Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Nonperforming Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Nonperforming assets:
Nonaccrual loans		$ 6	$ 1,168
Restructured loans in nonaccrual		2,763	4,687
Total nonperforming loans		2,769	5,855
Other real estate owned, net		2,817	3,156
Total nonperforming assets		$ 5,586	$ 9,011
Ratio of nonperforming assets to loans, net of unearned income and deferred fees and costs, plus other real estate owned		0.83%	1.38%
Ratio of allowance for loan losses to nonperforming loans	[1]	286.20%	141.76%

[1] The Company defines nonperforming loans as total nonaccrual and restructured loans that are nonaccrual. Loans 90 days past due and still accruing and accruing restructured loans are excluded.