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Note 7 - Segment and Geographic Information (Tables)
3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

Revenue

   

Accounts Receivable

 
   

Three Months Ended March 31,

   

March 31,

   

December 31,

 

Customers

 

2015

   

2014

   

2015

   

2014

 

Distributor A

    25 %     26 %     26 %     31 %

Distributor B

    *       10 %     14 %     10 %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   

Three Months Ended March 31,

 

Country or Region

 

2015

   

2014

 

China

  $ 45,802     $ 36,859  

Taiwan

    11,029       9,064  

Europe

    5,115       4,591  

Korea

    4,245       2,736  

Southeast Asia

    3,739       2,013  

Japan

    1,885       2,141  

United States

    1,693       2,603  

Other

    30       54  

Total

  $ 73,538     $ 60,061  
Revenue from External Customers by Products and Services [Table Text Block]
   

Three Months Ended March 31,

 

Product Family

 

2015

   

2014

 

DC to DC products

  $ 66,297     $ 53,935  

Lighting control products

    7,241       6,126  

Total

  $ 73,538     $ 60,061  
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
   

March 31,

   

December 31,

 

Country

 

2015

   

2014

 

China

  $ 38,593     $ 37,147  

United States

    35,989       33,913  

Bermuda

    13,016       13,383  

Other

    363       339  

Total

  $ 87,961     $ 84,782