Note 12 - Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Stock-based compensation expense	$ 345	$ 751	$ 1,047	$ 1,525
Cost of Sales [Member]
Stock-based compensation expense	5	99	13	185
Research and Development Expense [Member]
Stock-based compensation expense	30	16	69	36
General and Administrative Expense [Member]
Stock-based compensation expense	$ 310	$ 636	$ 965	$ 1,304