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PROPERTY, PLANT AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2016
PROPERTY, PLANT AND EQUIPMENT  
Schedule of property, plant and equipment
December 31,   Estimated
Useful Lives
  2016     2015  
(in thousands)                    
Land   N/A   $ 878     $ 657  
Buildings   7-40     18,314       17,586  
Operating equipment and property   3-15     10,070       10,843  
Furniture and fixtures   5-7     1,535       2,141  
Vehicles   5-10     6,007       6,697  
Gross property, plant and equipment         36,804       37,924  
Less: accumulated depreciation         (23,470 )     (25,163 )
Net property, plant and equipment       $ 13,334     $ 12,761