Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Nonperforming Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2017		Dec. 31, 2016	Mar. 31, 2016
Nonperforming assets:
Nonaccrual loans		$ 1,040		$ 1,168	$ 1,901
Restructured loans in nonaccrual		4,640		4,687	4,504
Total nonperforming loans		5,680	[1]	5,855	6,405
Other real estate owned, net		2,952		3,156	3,612
Total nonperforming assets		$ 8,632		$ 9,011	$ 10,017
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned		1.32%		1.38%	1.64%
Ratio of allowance for loan losses to nonperforming loans(1)	[2]	145.44%		141.76%	126.57%

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

[2] 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.