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, 2023	Dec. 31, 2022	Dec. 31, 2021
Total equity-based compensation expense	$ 16,198	$ 14,505	$ 13,055
Cost of Sales [Member]
Total equity-based compensation expense	826	687	513
Research and Development Expense [Member]
Total equity-based compensation expense	9,133	8,259	7,187
Sales and Marketing [Member]
Total equity-based compensation expense	1,776	1,503	1,608
General and Administrative Expense [Member]
Total equity-based compensation expense	3,795	2,888	3,291
Total Equity-based Compensation Expense From Continuing Operations [Member]
Total equity-based compensation expense	15,530	13,337	12,599
Equity-based Compensation Expense Included in Discontinued Operations [Member]
Total equity-based compensation expense	$ 668	$ 1,168	$ 456