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Property, Plant and Equipment, Net (Tables)
6 Months Ended
Jun. 30, 2012
Property, Plant and Equipment, Net [Abstract]  
Property, plant and equipment
                 
    June 30,
2012
    December 31,
2011
 

Cameroon Africa:

               

Machinery and equipment

  $ 3,149     $ 3,149  

Vehicles

    1,081       1,012  

Buildings

    413       412  

Furniture and equipment

    527       526  

Equipment in transit

    —         14  
   

 

 

   

 

 

 
      5,170       5,113  

Less accumulated depreciation

    (2,676     (2,287
   

 

 

   

 

 

 
      2,494       2,826  
   

 

 

   

 

 

 
     

Other Projects:

               

Machinery and equipment

  $ 144     $ 115  

Vehicles

    38       —    

Furniture and equipment

    525       536  

Equipment in transit

    52       —    

Other

    143       143  
   

 

 

   

 

 

 
      902       794  

Less accumulated depreciation

    (570     (518
   

 

 

   

 

 

 
      332       276  
   

 

 

   

 

 

 
    $ 2,826     $ 3,102