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Note 2 - Significant Accounting Policies and Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2017	Mar. 31, 2017	Mar. 31, 2016
Income Tax Expense (Benefit)		$ 2,523	$ 3,792
Accounting Standards Update 2015-17 [Member] \| Reclassification from Current Tax Assets to Long-term Deferred Tax Assets and Liabilities [Member] \| December 31, 2016 [Member]
Prior Period Reclassification Adjustment		6,825
Accounting Standards Update 2015-17 [Member] \| Reclassification from Non-Current Tax Assets to Long-term Deferred Tax Assets And Liabilities [Member] \| December 31, 2016 [Member]
Prior Period Reclassification Adjustment		2,493
Accounting Standards Update 2015-17 [Member] \| Reclassification from Current and Non-Current Tax Assets to Long-term Deferred Tax Assets And Liabilities [Member] \| December 31, 2016 [Member]
Prior Period Reclassification Adjustment		9,318
Accounting Standards Update 2016-09 [Member]
Cumulative Effect on Retained Earnings, Net of Tax	$ 850
Income Tax Expense (Benefit)		$ 210
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		(1,378)
Accounting Standards Update 2016-09 [Member] \| Reclassification from a Decrease in Financing Acticvities Cash Flows to an Increase in Operating Activities Cash Flows [Member] \| Quarter Ended March 31, 2016 [Member]
Prior Period Reclassification Adjustment		$ 41