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Note 7 - Segment and Geographic Information (Tables)
9 Months Ended
Sep. 30, 2015
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

 

2015

   

2014

   

2015

   

2014

 

Distributor A

    24 %     26 %     24 %     26 %

Distributor B

    *       10 %     *       10 %
Schedule of Accounts Receivable by Major Customers by Reporting Segments [Table Text Block]
   

September 30,

   

December 31,

 

Customers

 

2015

   

2014

 

Distributor A

    30 %     31 %

Distributor B

    12 %     10 %
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

 

2015

   

2014

   

2015

   

2014

 

China

  $ 58,716     $ 51,796     $ 157,968     $ 132,585  

Taiwan

    10,352       9,379       31,524       28,080  

Korea

    6,019       4,067       15,373       10,693  

Europe

    5,956       5,212       16,388       14,377  

Southeast Asia

    5,764       1,534       12,839       4,955  

Japan

    2,633       2,221       6,930       6,075  

United States

    1,673       4,079       4,932       9,913  

Other

    81       47       194       154  

Total

  $ 91,194     $ 78,335     $ 246,148     $ 206,832  
Revenue from External Customers by Products and Services [Table Text Block]
   

Three Months Ended September 30,

   

Nine Months Ended September 30,

 

Product Family

 

2015

   

2014

   

2015

   

2014

 

DC to DC products

  $ 82,718     $ 70,196     $ 222,210     $ 185,304  

Lighting control products

    8,476       8,139       23,938       21,528  

Total

  $ 91,194     $ 78,335     $ 246,148     $ 206,832  
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
   

September 30,

   

December 31,

 

Country

 

2015

   

2014

 

China

  $ 35,085     $ 37,147  

United States

    35,966       33,913  

Bermuda

    12,137       13,383  

Other

    528       339  

Total

  $ 83,716     $ 84,782