Note 2 - Concentration of Credit Risk and Major Customers (Details Textual) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 2,633	$ 1,617
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk Number of Customers	1
Concentration Risk, Percentage	29.00%	23.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage	24.00%		21.00%
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage	20.00%		22.00%
CHINA
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 1,229
MEXICO
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 13
Non-US [Member] | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	4.00%	5.00%