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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	$ 46,248	$ 45,004
Less: accumulated depreciation	(31,878)	(30,066)
Net property, plant and equipment	14,370	14,938
Land
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	878	878
Buildings
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	$ 21,275	20,966
Buildings | Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	7 years
Buildings | Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	40 years
Operating equipment and property
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	$ 13,455	12,923
Operating equipment and property | Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	3 years
Operating equipment and property | Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	15 years
Furniture and fixtures
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	$ 2,779	2,560
Furniture and fixtures | Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	5 years
Furniture and fixtures | Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	7 years
Vehicles
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	$ 7,861	$ 7,677
Vehicles | Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	5 years
Vehicles | Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	10 years

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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