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Note 7 - Segment and Geographic Information - Revenue by Product Family (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue $ 159,975 $ 128,939 [1] $ 428,885 $ 341,499 [1]
DC To DC Products [Member]        
Revenue 147,727 119,089 394,492 312,700
Lighting Control Products [Member]        
Revenue $ 12,248 $ 9,850 $ 34,393 $ 28,799
[1] 2017 amounts have not been adjusted under the modified retrospective method.