Note 11 - Stock-based Compensation Plan - Allocation of Share-based Compensation Expense (Details) - Restricted Stock [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-Based Payment Arrangement, Expense	$ 349	$ 474
Cost of Sales [Member]
Share-Based Payment Arrangement, Expense	31	19
Selling and Marketing Expense [Member]
Share-Based Payment Arrangement, Expense	11	10
Research and Development Expense [Member]
Share-Based Payment Arrangement, Expense	4	10
General and Administrative Expense [Member]
Share-Based Payment Arrangement, Expense	$ 303	$ 435