Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Nonperforming Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2016		Dec. 31, 2015	Sep. 30, 2015
Nonperforming assets:
Nonaccrual loans		$ 1,592		$ 2,043	$ 3,207
Restructured loans in nonaccrual		3,901		4,639	5,781
Total nonperforming loans		5,493	[1]	6,682	8,988
Other real estate owned, net		3,188		4,165	4,194
Total nonperforming assets		$ 8,681		$ 10,847	$ 13,182
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned		1.36%		1.74%	2.09%
Ratio of allowance for loan losses to nonperforming loans(1)	[2]	151.12%		124.17%	90.31%

[1] Only classes with past-due or nonaccrual loans are shown.

[2] The Company defines nonperforming loans as nonaccrual loans. Loans 90 days or more past due and still accruing and accruing restructured loans are excluded.