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Note 2 - Summary of Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts Receivable, before Allowance for Credit Loss | $ 558,491 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 12,025 | $ 12,001 |
Depreciation, Total | 42,155 | 36,493 | $ 32,265
Goodwill and Intangible Asset Impairment, Total | 0 | 0 | 0
Amortization of Financing Costs and Debt Discount Premium | 2,589 | 2,598 | 4,712
Deferred Costs Amortization Expense, Next Twelve Months | 2,603 |  |
Deferred Costs Amortization Expense, Year Two | 2,652 |  |
Deferred Costs Amortization Expense, Year Three | 2,709 |  |
Deferred Costs Amortization Expense, Year Four | 2,753 |  |
Deferred Costs Amortization Expense, Year Five | 2,499 |  |
Contract with Customer, Liability, Total | 27,388 | 25,710 |
Contract with Customer, Liability, Revenue Recognized | 25,184 |  |
Advertising Expense | 66,660 | 53,678 | 44,153
Research and Development Expense, Total | 104,303 | 80,251 | 68,394
Business Combination, Contingent Consideration, Liability, Total | 146,759 | 5,888 |
Business Combination, Acquisition Related Costs | 21,465 | 1,411 | 1,851
Reclassified From General and Administrative Expense to Acquisition Related Costs [Member] |  |  |
Business Combination, Acquisition Related Costs |  | 1,411 | $ 1,851
Other Accrued Liabilities [Member] |  |  |
Business Combination, Contingent Consideration, Liability, Total | 68,665 | $ 5,888 |
Other Long-term Liabilities [Member] |  |  |
Business Combination, Contingent Consideration, Liability, Total | 78,094 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Debt Instrument, Fair Value Disclosure, Total | 782,925 |  |
Term Loan [Member] |  |  |
Long-term Debt, Total | $ 768,119 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |
Concentration Risk, Percentage | 8.00% | 13.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |
Number of Major Customers | 0 | 0 | 0
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | No Customer [Member] |  |  |
Concentration Risk, Percentage | 6.00% | 6.00% | 5.00%

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