Note 10 - Common Stock and Stock-based Compensation Plans - Equity-based Compensation Expense Included in Interim Condensed Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total equity-based compensation expense	$ 3,303	$ 2,906	$ 6,692	$ 6,104
Cost of Revenues [Member]
Total equity-based compensation expense	344	119	683	262
Research and Development, Net [Member]
Total equity-based compensation expense	2,006	1,743	4,001	3,428
Sales and Marketing [Member]
Total equity-based compensation expense	340	367	673	785
General and Administrative [Member]
Total equity-based compensation expense	$ 613	$ 677	$ 1,335	$ 1,629