Note 2 - Impact of Recently Issued Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Expense (Benefit)	$ 5,812	$ 6,552
Effective Income Tax Rate Reconciliation, Percent	21.60%	30.60%
Unrecognized Excess Tax Benefits			$ 0
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)	$ (2,654)
Effective Income Tax Rate Reconciliation, Percent	(9.80%)
Reclassification from Financing Activities to Operating Activities [Member] | Three Months Ended March 31, 2016 [Member]
Prior Period Reclassification Adjustment	$ 404