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Note 7 - Segment and Geographic Information - Revenue by Region (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue $ 139,761 $ 112,198 [1] $ 268,911 $ 212,560
CHINA        
Revenue 81,207 62,325 154,072 118,409
TAIWAN, PROVINCE OF CHINA        
Revenue 18,150 17,286 34,541 32,161
Europe [Member]        
Revenue 12,651 9,593 24,116 17,501
KOREA, REPUBLIC OF        
Revenue 8,853 8,154 18,640 16,315
South East Asia [Member]        
Revenue 7,977 6,925 17,002 13,297
JAPAN        
Revenue 6,486 4,945 12,100 9,771
UNITED STATES        
Revenue 4,274 2,888 8,029 4,930
Other Region [Member]        
Revenue $ 163 $ 82 $ 411 $ 176
[1] 2017 amounts have not been adjusted under the modified retrospective method.