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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
PROPERTY, PLANT AND EQUIPMENT      
Total $ 23,095   $ 22,338
Less accumulated depreciation (5,451)   (5,210)
Total property, plant and equipment 17,644   17,128
Depreciation expense 241 $ 196  
Cost of product sales      
PROPERTY, PLANT AND EQUIPMENT      
Depreciation expense 89 $ 75  
Land      
PROPERTY, PLANT AND EQUIPMENT      
Total 8,616   8,081
Buildings and leasehold improvements      
PROPERTY, PLANT AND EQUIPMENT      
Total 9,344   9,234
Vehicles      
PROPERTY, PLANT AND EQUIPMENT      
Total 1,566   1,477
Machinery and equipment      
PROPERTY, PLANT AND EQUIPMENT      
Total 3,394   3,385
Furniture and fixtures      
PROPERTY, PLANT AND EQUIPMENT      
Total $ 175   $ 161