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Note 4 - Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Table Text Block]
   
March 31,
2013
   
December 31,
2012
 
             
Equipment (useful life 3 - 15 years)
  $ 5,885     $ 5,963  
Tooling (useful life 2 - 5 years)
    2,598       2,600  
Furniture and fixtures (useful life 5 years)
    132       132  
Computer software (useful life 3 years)
    450       462  
Leasehold improvements (the shorter of useful life or lease life)
    629       633  
Construction in progress
    66       50  
Property and equipment at cost
    9,760       9,840  
Less: accumulated depreciation
    (7,997 )     (8,040 )
Property and equipment, net
  $ 1,763     $ 1,800