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Note 12 - Significant Customers / Concentration - Concentration of Risk (Details) - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue Benchmark [Member] | Customer A [Member]    
Concentration Risk, Percentage 27.00% 29.00%
Revenue Benchmark [Member] | Customer B [Member]    
Concentration Risk, Percentage 10.00% 15.00%
Revenue Benchmark [Member] | Customer C [Member]    
Concentration Risk, Percentage   18.00%
Accounts Receivable [Member] | Customer A [Member]    
Concentration Risk, Percentage 39.00% 39.00%
Accounts Receivable [Member] | Customer B [Member]    
Concentration Risk, Percentage 12.00%  
Accounts Receivable [Member] | Customer D [Member]    
Concentration Risk, Percentage 16.00% 0.00%
Accounts Receivable [Member] | Customer E [Member]    
Concentration Risk, Percentage   15.00%