Note 11 - Stock-Based Compensation (Details) - Stock-based Compensation Expense - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense before income taxes	$ 566	$ 691	$ 1,561	$ 1,459
Less: deferred tax benefit	(198)	(242)	(546)	(510)
Reduction of net income	$ 368	$ 449	$ 1,015	$ 949