Note 11 - Stock-based Compensation Plan - Allocation of Share-based Compensation Expense (Details) - Restricted Stock [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Compensation expense	$ 537	$ 544	$ 1,450	$ 1,623
Cost of Sales [Member]
Compensation expense	39	28	107	76
Selling and Marketing Expense [Member]
Compensation expense	12	9	37	30
Research and Development Expense [Member]
Compensation expense	9	(1)	21	18
General and Administrative Expense [Member]
Compensation expense	$ 477	$ 508	$ 1,285	$ 1,499