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Note 7 - Segment and Geographic Information - Revenue by Product Family (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
DC To DC Products [Member]        
Revenue 127,496 102,187 246,765 193,611
Lighting Control Products [Member]        
Revenue $ 12,265 $ 10,011 $ 22,146 $ 18,949
[1] 2017 amounts have not been adjusted under the modified retrospective method.