Note 8 - Share-based Compensation - Share-based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total share-based compensation expense	$ 801	$ 1,145	$ 2,652	$ 3,577
Share-based compensation capitalized in intangible assets	17	23	68	94
Total share-based compensation	818	1,168	2,720	3,671
Selling and Marketing Expense [Member]
Total share-based compensation expense	107	188	420	560
Research and Development Expense [Member]
Total share-based compensation expense	125	167	383	668
General and Administrative Expense [Member]
Total share-based compensation expense	$ 569	$ 790	$ 1,849	$ 2,349