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Note 8 - Geographic Information and Major Customer Data - Revenues Based On Customer Location (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 25,402 $ 23,615
UNITED STATES    
Revenues 3,950 3,295
Europe and Middle East [Member]    
Revenues 1,099 5,103
Asia Pacific [Member]    
Revenues 20,353 15,217
GERMANY    
Revenues   3,964
CHINA    
Revenues $ 17,259 $ 12,074