Note 13 - 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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-Based Payment Arrangement, Expense	$ 450	$ 371	$ 1,373	$ 1,094
Cost of Sales [Member]
Share-Based Payment Arrangement, Expense	18	10	44	17
Selling and Marketing Expense [Member]
Share-Based Payment Arrangement, Expense	9	8	23	17
Research and Development Expense [Member]
Share-Based Payment Arrangement, Expense	6	17	43	43
General and Administrative Expense [Member]
Share-Based Payment Arrangement, Expense	$ 417	$ 336	$ 1,263	$ 1,017