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Note 8 - Significant Customers / Concentration / Disaggregated Revenue - Concentration of Risk (Details) - Customer Concentration Risk [Member]
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue Benchmark [Member] | Customer A [Member]          
Concentration Risk, Percentage 18.00% 33.00% 30.00% 30.00%  
Revenue Benchmark [Member] | Customer B [Member]          
Concentration Risk, Percentage 15.00%   13.00%    
Revenue Benchmark [Member] | Customer D [Member]          
Concentration Risk, Percentage   10.00%   12.00%  
Revenue Benchmark [Member] | Customer E [Member]          
Concentration Risk, Percentage   43.00%   33.00%  
Accounts Receivable [Member] | Customer A [Member]          
Concentration Risk, Percentage     26.00%   39.00%
Accounts Receivable [Member] | Customer B [Member]          
Concentration Risk, Percentage     25.00%   15.00%
Accounts Receivable [Member] | Customer D [Member]          
Concentration Risk, Percentage     11.00%    
Accounts Receivable [Member] | Customer C [Member]          
Concentration Risk, Percentage         17.00%