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Note 7 - Segment, Significant Customers and Geographic Information (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Revenue

  

Accounts Receivable

 
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

  

September 30,

  

December 31,

 

Customer

 

2020

  

2019

  

2020

  

2019

  

2020

  

2019

 

Distributor A

  22%  24%  23%  23%  21%  24%

Distributor B

  11%  *   *   *   14%  11%

Value-added reseller A

  *   *   *   *   11%  13%

Direct customer A

  14%  *   11%  *   26%  * 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 

Country or Region

 

2020

  

2019

  

2020

  

2019

 

China

 $157,215  $105,857  $375,708  $276,892 

Taiwan

  40,782   18,547   79,644   55,912 

Europe

  14,255   12,047   40,770   38,071 

South Korea

  20,935   11,990   44,452   31,224 

Southeast Asia

  11,854   7,904   32,256   23,698 

Japan

  9,433   8,150   25,079   21,084 

United States

  4,880   4,225   13,298   14,044 

Other

  68   93   202   258 

Total

 $259,422  $168,813  $611,409  $461,183 
Revenue from External Customers by Products and Services [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 

Product Family

 

2020

  

2019

  

2020

  

2019

 

DC to DC

 $247,561  $159,723  $580,549  $432,125 

Lighting Control

  11,861   9,090   30,860   29,058 

Total

 $259,422  $168,813  $611,409  $461,183 
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
  

September 30,

  

December 31,

 

Country

 

2020

  

2019

 

China

 $143,848  $113,888 

United States

  101,884   94,671 

Taiwan

  18,122   17,652 

Other

  6,456   2,104 

Total

 $270,310  $228,315