Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification of Deferred Tax Assets and Liabilities to Noncurrent Classification [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment		$ 8,000
Accounting Standards Update 2016-09 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]
Income Tax Expense (Benefit)	$ (100)			$ (300)
Net Cash Provided by (Used in) Operating Activities, Continuing Operations				300
Net Cash Provided by (Used in) Financing Activities, Continuing Operations				(300)
New Accounting Pronouncement, Early Adoption, Effect [Member]
Income Tax Expense (Benefit)		5,633
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		(13,377)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		$ 18,724
Other Comprehensive Income (Loss), Tax	(900)		$ 600	(1,300)	$ 600
Income Tax Expense (Benefit)	$ 6,258		$ 5,881	11,891	11,148
Net Cash Provided by (Used in) Operating Activities, Continuing Operations				15,737	4,989
Net Cash Provided by (Used in) Financing Activities, Continuing Operations				$ (5,185)	$ (466)