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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	$ 45,004	$ 43,054
Less: accumulated depreciation	(30,066)	(28,258)
Net property, plant and equipment	14,938	14,796
Land
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	878	878
Buildings
PROPERTY, PLANT AND EQUIPMENT
Gross property, plant and equipment	$ 20,966	20,552
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	$ 12,923	11,891
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	$ 2,560	1,999
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	$ 7,677	$ 7,734
Vehicles | Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	5 years
Vehicles | Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	10 years

X

- Definition

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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