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PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 56,364	$ 55,736
Accumulated Depreciation	(32,743)	(29,533)
Net Book Value	23,621	26,203
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(16,150)	(14,115)
Net Book Value	13,060	15,095
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,626
Accumulated Depreciation	(4,088)	(3,179)
Net Book Value	9,538	10,447
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	13,528	12,900
Accumulated Depreciation	(12,505)	(12,239)
Net Book Value	$ 1,023	$ 661

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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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