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Note 11 - Geographic Information and Major Customer and Product Data - Major Customers Data as Percentage of Total Revenues (Details) - Revenue from Contract with Customer [Member] - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Customer A [Member]      
Percentage of total revenues 15.00% 23.00% 27.00%
Customer B [Member]      
Percentage of total revenues   17.00% 19.00%
Customer C [Member]      
Percentage of total revenues 19.00%