Note 11 - Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Stock-based compensation expense	$ 638	$ 594	$ 2,163	$ 1,880
Cost of Sales [Member]
Stock-based compensation expense	28	35	213	82
Research and Development Expense [Member]
Stock-based compensation expense	6	8	42	48
General and Administrative Expense [Member]
Stock-based compensation expense	$ 604	$ 551	$ 1,908	$ 1,750