Note 2 - Concentration of Credit Risk and Major Customers (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021	Sep. 30, 2022 USD ($)	Sep. 30, 2021	Dec. 31, 2021
Excess Cash Balances, Number of High Credit Quality Financial Institutions			2
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | One Customer [Member]
Concentration Risk Number of Customers	1			1
Concentration Risk, Percentage	28.00%		26.00%	26.00%
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Two Customers [Member]
Concentration Risk Number of Customers		2
Concentration Risk, Percentage		36.00%
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Largest Customer [Member]
Concentration Risk, Percentage		3.00%	4.00%	3.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk Number of Customers					1
Concentration Risk, Percentage					19.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk Number of Customers			2
Concentration Risk, Percentage			43.00%
UNITED STATES
Excess Cash Balances, Number of High Credit Quality Financial Institutions			1,000
Cash	$ 2,092		$ 2,092
CHINA
Excess Cash Balances, Number of High Credit Quality Financial Institutions			1
Cash	561		$ 561
MEXICO
Cash	$ 11		$ 11