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Note 8 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member]
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Customer A [Member]      
Revenue Percentage by Major Customer 41.00% 53.00% 52.00%
Customer B [Member]      
Revenue Percentage by Major Customer 11.00% 12.00% 11.00%
Customer C [Member]      
Revenue Percentage by Major Customer [1]     16.00%
[1] represents less than 10%