Note 17 - Stock-Based Compensation (Details) - Stock-based Compensation Expense - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense before income taxes	$ 2,134	$ 2,016	$ 1,940
Less: deferred tax benefit	(747)	(706)	(679)
Reduction of net income	$ 1,387	$ 1,310	$ 1,261