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Note 12 - Concentrations (Details Textual) - 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]          
Number of Customers     1 1  
Revenue Benchmark [Member] | Domestic Distributor [Member]          
Concentration Risk, Percentage 40.00% 52.00% 37.00% 50.00%  
Revenue Benchmark [Member] | International Distributor [Member]          
Concentration Risk, Percentage 23.00%        
Accounts Receivable [Member]          
Concentration Risk, Percentage         77.00%
Accounts Receivable [Member] | Domestic Distributor [Member]          
Concentration Risk, Percentage     61.00%    
Accounts Receivable [Member] | International Distributor [Member]          
Concentration Risk, Percentage     0.00%