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Note 2 - Concentration of Credit Risk and Major Customers (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
Jun. 30, 2020
USD ($)
Jun. 30, 2019
Dec. 31, 2019
Excess Cash Balances, Number of High Credit Quality Financial Institutions     2    
Cash, Ending Balance $ 754   $ 754    
Concentration Risk, Number of Divisions     2 2  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Division One of Largest Customer [Member]          
Concentration Risk, Percentage 20.00% 21.00% 22.00% 22.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Division Two of Largest Customer [Member]          
Concentration Risk, Percentage 3.00% 2.00% 2.00% 2.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Largest Customer [Member]          
Concentration Risk, Percentage 23.00% 23.00% 24.00% 24.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Largest Customer [Member]          
Concentration Risk, Percentage     40.00%   36.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Largest Customer [Member]          
Concentration Risk, Percentage 9.00% 17.00% 11.00% 18.00%  
UNITED STATES          
Excess Cash Balances, Number of High Credit Quality Financial Institutions     1    
CHINA          
Excess Cash Balances, Number of High Credit Quality Financial Institutions     1    
Cash, Ending Balance $ 318   $ 318