Note 11 - Stock-based Compensation Plan - Allocation of Share-based Compensation Expense (Details) - Restricted Stock [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement, Expense	$ 564	$ 605	$ 913	$ 1,079
Cost of Sales [Member]
Share-Based Payment Arrangement, Expense	37	29	68	48
Selling and Marketing Expense [Member]
Share-Based Payment Arrangement, Expense	14	11	25	21
Research and Development Expense [Member]
Share-Based Payment Arrangement, Expense	8	9	12	19
General and Administrative Expense [Member]
Share-Based Payment Arrangement, Expense	$ 505	$ 556	$ 808	$ 991