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Note 11 - Significant Customers / Concentration - Concentration of Risk (Details) - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue Benchmark [Member] | Customer A [Member]    
Concentration Risk, Percentage 29.00% [1]
Revenue Benchmark [Member] | Customer B [Member]    
Concentration Risk, Percentage 18.00% 10.00%
Revenue Benchmark [Member] | Customer C [Member]    
Concentration Risk, Percentage 15.00% [1]
Accounts Receivable [Member] | Customer A [Member]    
Concentration Risk, Percentage 39.00% 58.00%
Accounts Receivable [Member] | Customer D [Member]    
Concentration Risk, Percentage 15.00% [1]
[1] Zero or less than 10%