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Note 6 - Segment and Geographic Information - Customers with Sales Greater than 10% (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Distributor A [Member]        
Concentration risk 17.00% 22.00% 17.00% 22.00%
Distributor B [Member]        
Concentration risk 15.00% [1] [1] [1]
[1] Represents less than 10%.