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Note 16 - Segment and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2020
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

 

2020

  

2019

  

2018

 

China

 $516,519  $382,740  $334,726 

Taiwan

  109,256   73,801   75,307 

Europe

  56,329   49,467   49,484 

South Korea

  64,093   43,900   41,238 

Southeast Asia

  42,403   32,031   36,495 

Japan

  35,461   27,812   26,853 

United States

  20,098   17,836   17,621 

Other

  293   334   658 

Total

 $844,452  $627,921  $582,382 
Revenue from External Customers by Products and Services [Table Text Block]
  

Year Ended December 31,

 

Product Family

 

2020

  

2019

  

2018

 

DC to DC

 $800,478  $589,651  $537,512 

Lighting Control

  43,974   38,270   44,870 

Total

 $844,452  $627,921  $582,382 
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
  

December 31,

 

Country

 

2020

  

2019

  

2018

 

China

 $151,752  $113,888  $93,096 

United States

  101,768   94,671   39,054 

Taiwan

  18,797   17,652   16,972 

Other

  9,211   2,104   879 

Total

 $281,528  $228,315  $150,001