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Note 6 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

Three months ended September 30,

   

Nine months ended September 30,

 

Customers

 

2013

   

2012

   

2013

   

2012

 
                                 

A

    33 %     36 %     32 %     32 %
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 and Region

 

2013

   

2012

   

2013

   

2012

 

China

  $ 40,577     $ 31,023     $ 102,099     $ 95,207  

Taiwan

    8,886       7,579       24,726       21,814  

Europe

    3,949       5,004       11,226       12,987  

Korea

    2,599       3,022       7,425       7,581  

Japan

    2,285       2,029       5,446       6,690  

USA

    1,812       1,437       5,552       4,150  

Rest of Asia

    5,103       6,309       17,817       16,658  

Other

    136       105       240       512  

Total

  $ 65,347     $ 56,508     $ 174,531     $ 165,599  
Revenue from External Customers by Products and Services [Table Text Block]
   

Three months ended September 30,

   

Nine months ended September 30,

 

Product Family

 

2013

   

2012

   

2013

   

2012

 

DC to DC converters

  $ 57,823     $ 49,710     $ 154,801     $ 145,217  

Lighting control products

    7,524       6,798       19,730       20,382  

Total

  $ 65,347     $ 56,508     $ 174,531     $ 165,599  
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
   

September 30,

2013

   

December 31,

2012

 

China

  $ 43,628     $ 37,071  

USA

    24,738       23,163  

Taiwan

    80       90  

Japan

    40       57  

Other

    88       55  

Total

  $ 68,574     $ 60,436