Note 2 - Summary of Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Depreciation, Total	$ 32,265	$ 25,296	$ 23,127
Goodwill and Intangible Asset Impairment, Total	0	0	0
Amortization of Financing Costs and Debt Discount Premium	4,712	4,749	3,516
Deferred Costs Amortization Expense, Next Twelve Months	2,598
Deferred Costs Amortization Expense, Year Two	2,640
Deferred Costs Amortization Expense, Year Three	2,689
Deferred Costs Amortization Expense, Year Four	2,579
Deferred Costs Amortization Expense, Year Five	2,508
Contract with Customer, Liability, Total	9,952	14,174
Contract with Customer, Liability, Revenue Recognized	9,589
Advertising Expense	44,153	34,792	45,926
Research and Development Expense, Total	68,394	$ 50,019	$ 42,869
Fair Value, Inputs, Level 2 [Member]
Debt Instrument, Fair Value Disclosure, Total	833,092
Term Loan [Member]
Long-term Debt, Total	$ 812,953
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage	9.00%	11.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage	5.00%	6.00%	6.00%
Number of Major Customers	0	0	0