Note 16 - Stock-based Compensation - Compensation Related to Stock-based Awards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cost of revenues	$ 5,157	$ 3,955	$ 5,571
Tax effect on stock-based compensation expense	617	440	836
Net effect of stock-based compensation expense	4,540	3,515	4,735
Cost of Sales [Member]
Cost of revenues	2,400	1,753	3,076
Selling and Marketing Expense [Member]
Cost of revenues	247	123	261
General and Administrative Expense [Member]
Cost of revenues	$ 2,510	$ 2,079	$ 2,234