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Note 7 - Segment, Significant Customers and Geographic Information (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 

Customer

 

2021

  

2020

  

2021

  

2020

 

Distributor A

  28%  26%  27%  24%

Distributor B

  17%  *   17%  * 
  

June 30,

  

December 31,

 

Customer

 

2021

  

2020

 

Distributor A

  15%  24%

Distributor B

  21%  21%

Value-added reseller A

  16%  13%

Direct customer A

  *   10%
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 

Country or Region

 

2021

  

2020

  

2021

  

2020

 

China

 $170,893  $112,756  $324,276  $218,493 

Taiwan

  48,262   22,322   78,708   38,862 

Europe

  20,790   13,443   41,170   26,515 

South Korea

  18,992   12,573   38,279   23,517 

Southeast Asia

  12,188   11,622   23,686   20,402 

Japan

  14,552   8,756   26,602   15,646 

United States

  7,542   4,681   14,844   8,418 

Other

  98   56   207   134 

Total

 $293,317  $186,209  $547,772  $351,987 
Revenue from External Customers by Products and Services [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 

Product Family

 

2021

  

2020

  

2021

  

2020

 

DC to DC

 $278,808  $176,113  $520,237  $332,988 

Lighting Control

  14,509   10,096   27,535   18,999 

Total

 $293,317  $186,209  $547,772  $351,987 
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
  

June 30,

  

December 31,

 

Country

 

2021

  

2020

 

China

 $185,080  $151,752 

United States

  112,295   101,768 

Taiwan

  18,981   18,797 

Other

  15,737   9,211 

Total

 $332,093  $281,528