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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