Note 11 - Stock-based Compensation - Noncash Stock-based Compensation Expense Related to Stock Options, ESPP, and RSUs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Allocated Share-based Compensation Expense	$ 127	$ 1,015
Cost of Sales [Member]
Allocated Share-based Compensation Expense	18	101
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	37	287
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense	$ 72	$ 627