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Note 1 - Organization and Significant Accounting Policies - Equity-based Compensation Expenses Related to Stock Options, SARs, RSUs and Employee Stock Purchase Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total equity-based compensation expense	$ 13,055	$ 13,636	$ 10,718
Cost of Sales [Member]
Total equity-based compensation expense	818	639	630
Research and Development Expense [Member]
Total equity-based compensation expense	7,287	6,874	5,857
Sales and Marketing [Member]
Total equity-based compensation expense	1,626	2,038	1,495
General and Administrative Expense [Member]
Total equity-based compensation expense	$ 3,324	$ 4,085	$ 2,736