Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Expense (Benefit)	$ 474	$ 344
Effective Income Tax Rate Reconciliation, Percent	3.20%	3.20%
Unrecognized Tax Benefits	$ 15,000		$ 14,400
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3,800		3,500
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 400		$ 300