Note 14 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Expense (Benefit)	$ 6,373	$ 4,903	$ 8,944	$ 8,789
Effective Income Tax Rate Reconciliation, Percent	35.90%	36.30%	34.70%	36.20%
Decrease in Effective Income Tax Rate due to Excess Tax Benefits from Share-based Compensation	0.00%		1.20%
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		$ 100		$ 400
Deferred Tax Assets, Valuation Allowance	$ 0		$ 0		$ 0
Excess Tax Benefits from Share-based Compensation	$ 300		$ 300