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Note 11 - Revenue from Significant Customers (Details) - Sales Revenue, Goods, Net [Member] - Customer Concentration Risk [Member]
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Concentration Risk, Percentage 64.00% 50.00% 60.00% 49.00%
Converted Product Customer 1 [Member]        
Concentration Risk, Percentage 28.00% 34.00% 30.00% 35.00%
Converted Product Customer 2 [Member]        
Concentration Risk, Percentage 15.00% 16.00% 15.00% 14.00%
Converted Product Customer 3 [Member]        
Concentration Risk, Percentage 21.00% 0.00% [1] 15.00% 0.00% [1]
[1] Customer did not account for more than 10% of sales during the period indicated