Note 10 - Stock-based Compensation - Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock based compensation	$ 592	$ 78
Cost of Sales [Member]
Stock based compensation	11	1
General and Administrative Expense [Member]
Stock based compensation	335	37
Selling and Marketing Expense [Member]
Stock based compensation	127	21
Research and Development Expense [Member]
Stock based compensation	$ 119	$ 19