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Note 8 - Segment and Geographic Information - Customers with Sales and Accounts Receivable Greater Than 10% (Details) - Customer Concentration Risk [Member]
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Revenue Benchmark [Member] | Distributor A [Member]          
Concentration risk 24.00% 23.00% 23.00% 21.00%  
Revenue Benchmark [Member] | Distributor B [Member]          
Concentration risk [1]   10.00%   10.00%  
Accounts Receivable [Member] | Distributor A [Member]          
Concentration risk     25.00%   25.00%
Accounts Receivable [Member] | Distributor B [Member]          
Concentration risk [1]     12.00%   16.00%
Accounts Receivable [Member] | End Customer [Member]          
Concentration risk     10.00%    
[1] Represents less than 10%.