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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Total equity-based compensation expense	$ 10,718	$ 10,367	$ 8,693
Cost of Sales [Member]
Total equity-based compensation expense	630	588	459
Research and Development Expense [Member]
Total equity-based compensation expense	5,857	5,141	3,839
Sales and Marketing [Member]
Total equity-based compensation expense	1,495	1,587	1,428
General and Administrative Expense [Member]
Total equity-based compensation expense	$ 2,736	$ 3,051	$ 2,967