Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Nonperforming Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Nonaccrual loans		$ 1,901	$ 2,043	$ 3,102
Restructured loans in nonaccrual		4,504	4,639	6,123
Total nonperforming loans		6,405	6,682	9,225
Other real estate owned, net		3,612	4,165	4,573
Total nonperforming assets		$ 10,017	$ 10,847	$ 13,798
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned		1.64%	1.74%	2.20%
Ratio of allowance for loan losses to nonperforming loans(1)	[1]	126.57%	124.17%	89.51%

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