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Note 8 - Significant Customers / Concentration / Disaggregated Revenue - Concentration of Risk (Details) - Customer Concentration Risk [Member]
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue Benchmark [Member] | Customer A [Member]    
Concentration Risk, Percentage 35.00% 13.00% [1]
Revenue Benchmark [Member] | Customer B [Member]    
Concentration Risk, Percentage 12.00% 20.00%
Revenue Benchmark [Member] | Customer C [Member]    
Concentration Risk, Percentage 12.00% [1]
Revenue Benchmark [Member] | Customer D [Member]    
Concentration Risk, Percentage 11.00% [1]
Revenue Benchmark [Member] | Customer E [Member]    
Concentration Risk, Percentage [1] 19.00%
Accounts Receivable [Member] | Customer A [Member]    
Concentration Risk, Percentage 40.00% 39.00%
Accounts Receivable [Member] | Customer C [Member]    
Concentration Risk, Percentage 16.00% 15.00%
Accounts Receivable [Member] | Customer D [Member]    
Concentration Risk, Percentage 11.00% [1]
Accounts Receivable [Member] | Customer E [Member]    
Concentration Risk, Percentage [1]
[1] Zero or less than 10%