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Note 2 - Property and Equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]

2.  Property and Equipment


Property and equipment consist of (in thousands):


   

December 31,

 
   

2014

   

2013

 

Computer equipment

  $ 9,817     $ 9,969  

Software

    3,369       3,441  

Furniture, fixtures, and equipment

    756       734  

Leasehold improvements

    1,127       1,052  

Test equipment

    6,401       4,928  

Construction-in-progress

    2,405       1,421  
      23,875       21,545  

Accumulated depreciation and amortization

    (15,043

)

    (14,481

)

    $ 8,832     $ 7,064  

Depreciation and amortization expense for years ended December 31, 2014, 2013 and 2012 was $2.0 million, $1.4 million and $0.5 million, respectively.