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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Operating lease right of use asset	$ 922	$ 0	$ 1,140
Percentage of fair value investment	16.50%
Operating Lease, Liability	$ 1,046		$ 1,230
Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)		3 years
Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)		15 years
Buildings
Property, Plant and Equipment [Line Items]
Useful life (in years)		15 years
Shop tools and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Shop tools and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Mining equipment
Property, Plant and Equipment [Line Items]
Useful life (in years)		5 years
Office equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	4 years
Office equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	7 years
Light trucks and utility vehicles
Property, Plant and Equipment [Line Items]
Useful life (in years)		5 years

X

- Definition

Percentage Of Fair Value Investment

+ References

No definition available.

+ Details

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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

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- Details

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