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Note 11 - Geographic Information and Major Customer and Product Data - Summary of Revenues Within Geographical Areas (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues $ 164,456 $ 127,210 $ 101,348
UNITED STATES      
Revenues 100,281 73,343 56,910
EMEA [Member]      
Revenues [1] 52,410 44,994 35,809
Rest of World [Member]      
Revenues $ 11,765 $ 8,873 $ 8,629
[1] Sales to customers in France accounted for $17,129, $13,570 and $10,419 for the years ended December 31, 2016, 2015 and 2014, respectively.