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3. Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2017
Statement of Operations Data  
Schedule of Property, plant and equipment
   

March 31,

2017  

    

December 31,

2016  

  
Land   $ 2,738     $ 2,713  
Plant and buildings     82,282       81,755  
Furniture and fixtures     603       572  
Machinery and equipment     4,353       4,308  
Construction in progress     104       88  
Total gross property, plant & equipment     90,080       89,436  
Less accumulated depreciation     (24,410 )     (23,066 )
Total net property, plant & equipment   $ 65,670     $ 66,370  
Depreciation of property, plant, and equipment
    Years  
Plant and buildings     20 - 30  
Machinery & equipment     5 - 7  
Furniture & fixtures     3 - 5