Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Unbilled Receivables, Expected Billing Period (Year)	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Research and Development Expense, Total	$ 49,200	$ 48,900	$ 60,000
Advertising Expense	12,000	8,500	10,700
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
First Option to Extend Corporate Headquarters [Member]
Lessee, Leases, Number of Extensions	1
Lessee, Lease, Extension Lease Term (Year)	10 years
Second Option to Extend Corporate Headquarters [Member]
Lessee, Leases, Number of Extensions	2
Lessee, Lease, Extension Lease Term (Year)	5 years
Hyderabad, India Office [Member]
Lessee, Leases, Termination Period (Month)	6 months

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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