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PROPERTY, PLANT AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2018
PROPERTY, PLANT AND EQUIPMENT  
Schedule of property, plant and equipment
December 31,   Estimated
Useful Lives
  2018     2017  
(in thousands)                    
Land   N/A   $ 878     $ 878  
Buildings   7-40     19,705       19,611  
Operating equipment and property   3-15     11,016       10,360  
Furniture and fixtures   5-7     1,785       1,488  
Vehicles   5-10     7,381       6,276  
Gross property, plant and equipment         40,765       38,613  
Less: accumulated depreciation         (26,213 )     (24,395 )
Net property, plant and equipment       $ 14,552     $ 14,218