Note 2 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended			9 Months Ended
	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Reclassification of Deferred Tax Assets and Liabilities to Noncurrent Classification [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment		$ 8,000,000
Accounting Standards Update 2016-09 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]
Income Tax Expense (Benefit)	$ (200,000)			$ (500,000)
Net Cash Provided by (Used in) Operating Activities, Continuing Operations				500,000
Net Cash Provided by (Used in) Financing Activities, Continuing Operations				$ (500,000)
New Accounting Pronouncement, Early Adoption, Effect [Member]
Income Tax Expense (Benefit)		5,633,000
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		(13,377,000)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		$ 18,724,000
Number of Reporting Units				1
Goodwill, Impaired, Accumulated Impairment Loss	0			$ 0
Other Comprehensive Income (Loss), Tax	1,600,000		$ 800,000	3,000,000	$ 200,000
Income Tax Expense (Benefit)	$ 8,664,000		$ 7,226,000	20,555,000	18,374,000
Net Cash Provided by (Used in) Operating Activities, Continuing Operations				57,818,000	42,901,000
Net Cash Provided by (Used in) Financing Activities, Continuing Operations				$ (44,672,000)	$ (36,208,000)