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PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Cost	$ 55,736	$ 56,310
Accumulated Depreciation	(29,533)	(26,467)
Net Book Value	26,203	29,843
Nichols Ranch
Property, Plant and Equipment [Line Items]
Cost	29,210	29,210
Accumulated Depreciation	(14,115)	(12,021)
Net Book Value	15,095	17,189
Alta Mesa
Property, Plant and Equipment [Line Items]
Cost	13,626	13,656
Accumulated Depreciation	(3,179)	(2,319)
Net Book Value	10,447	11,337
Equipment and other
Property, Plant and Equipment [Line Items]
Cost	12,900	13,444
Accumulated Depreciation	(12,239)	(12,127)
Net Book Value	$ 661	$ 1,317

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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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