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Note 16 - Segment and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   

Year Ended December 31,

 

Country or Region

 

2019

   

2018

   

2017

 

China

  $ 382,740     $ 334,726     $ 257,787  

Taiwan

    73,801       75,307       83,357  

Europe

    49,467       49,484       38,140  

Korea

    43,900       41,238       34,155  

Southeast Asia

    32,031       36,495       25,755  

Japan

    27,812       26,853       20,187  

United States

    17,836       17,621       11,113  

Other

    334       658       435  

Total

  $ 627,921     $ 582,382     $ 470,929  
Revenue from External Customers by Products and Services [Table Text Block]
   

Year Ended December 31,

 

Product Family

 

2019

   

2018

   

2017

 

DC to DC

  $ 589,651     $ 537,512     $ 431,861  

Lighting Control

    38,270       44,870       39,068  

Total

  $ 627,921     $ 582,382     $ 470,929  
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
   

December 31,

 

Country

 

2019

   

2018

   

2017

 

China

  $ 113,888     $ 93,096     $ 89,472  

United States

    94,671       39,054       37,539  

Taiwan

    17,652       16,972       17,238  

Other

    2,104       879       387  

Total

  $ 228,315     $ 150,001     $ 144,636