Note 11 - Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Stock-based compensation expense	$ 751	$ 599	$ 1,525	$ 1,286
Cost of Sales [Member]
Stock-based compensation expense	99	18	185	47
Research and Development Expense [Member]
Stock-based compensation expense	16	22	36	40
General and Administrative Expense [Member]
Stock-based compensation expense	$ 636	$ 559	$ 1,304	$ 1,199