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Note 8 - Geographic Information and Major Customer Data - Revenues Based On Customer Location (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenues $ 24,960 $ 23,471 $ 72,181 $ 58,840
UNITED STATES        
Revenues 3,079 3,811 13,754 7,713
Europe and Middle East [Member]        
Revenues 825 6,911 10,017 13,245
Asia Pacific [Member]        
Revenues 21,056 12,749 48,410 37,882
GERMANY        
Revenues   5,425   10,613
CHINA        
Revenues $ 16,085 $ 8,993 $ 37,713 25,542
JAPAN        
Revenues       $ 6,544