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Note 15 - Significant Customers (Details) - Customers with Sales Greater than 10% - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Distributor A [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk 24.00% 26.00% 32.00%
Distributor B [Member]      
Revenue, Major Customer [Line Items]      
Concentration risk [1] [1] 10.00%
[1] Represents less than 10%.