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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]

Property, plant and equipment consisted of the following (in thousands):

  

    December 31,  
    2012     2011  
Machinery, equipment and vehicles   $ 15,043     $ 13,602  
Furniture and fixtures     2,274       1,884  
Leasehold improvements     1,058       928  
Buildings     396       379  
      18,771       16,793  
Accumulated depreciation and amortization     (13,260 )     (11,231 )
    $ 5,511     $ 5,562