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Note 10 - Customer and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2014
Segment Reporting [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

Year Ended December 31,

 

Customer

 

2014

   

2013

   

2012

 

A

    52

%

    33

%

    40

%

B

    16

%

    17

%

    20

%

C

    11

%

    24

%

    13

%

Schedule of Receivables by Major Customers [Table Text Block]
   

December 31,

 

Customer

 

2014

   

2013

 

A

    51

%

    36

%

B

    21

%

    17

%

C

    *       23

%

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

Year Ended December 31,

 
   

2014

   

2013

   

2012

 
   

Revenues

   

Percentage of

Revenues

   

Revenues

   

Percentage of

Revenues

   

Revenues

   

Percentage of

Revenues

 

United States

  $ 44,963       44

%

  $ 39,057       38

%

  $ 35,509       40

%

Germany

    35,142       35       22,431       22       25,928       29  

South Korea

    5,667       6       20,953       21       9,160       10  

Japan

    3,789       4       8,340       8       8,514       10  

Rest of the world

    10,602       11       10,672       11       10,429       11  

Total revenue

  $ 100,163       100

%

  $ 101,453       100

%

  $ 89,540       100

%

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

December 31,

 
   

2014

   

2013

 

United States

  $ 8,240     $ 6,578  

Rest of the world

    592       486  

Total long-lived assets, net

  $ 8,832     $ 7,064