LEASES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Right-of-use lease asset	$ 353,000	$ 470,000	$ 595,870
Lease liability	363,000		599,596
Current portion of lease liabilities	$ 149,000	147,000
Lease term using a discount rate	9.50%
Lease expense:
Operating lease cost	$ 161,000
Supplemental cash flow information related to leases:
Cash flows from operating leases	153,000
Operating leases	353,000
Supplemental balance sheet information related to leases:
Operating lease right-of-use assets	353,000
Current portion of lease liabilities	149,000	147,000
Operating lease liabilities - Long term portion	214,000	$ 332,000
Total operating lease liabilities	$ 363,000		$ 599,596
Weighted Average Remaining Lease Term (in years)	3 years
Discount Rate	9.50%
Remaining undiscounted cash payments through 2023	$ 406,000
Corporate office
Lessee, Lease, Description [Line Items]
Variable lease terms	Because these amounts are variable from year to year and not specifically set in the lease terms, they are not included in the measurement of the right-of-use asset and related lease liability, but rather expensed in the period incurred.
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Option to extend, renewal term	3 years
Continuing operations
Lease expense:
Operating lease cost	$ 155,000
Discontinued operations.
Lease expense:
Operating lease cost	$ 6,000
Minimum | Corporate offices, storage space and equipment
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum | Corporate offices, storage space and equipment
Lessee, Lease, Description [Line Items]
Remaining lease term	5 years
Maximum | Land used in exploration and mining activities, office equipment, machinery, office space, storage and other
Lessee, Lease, Description [Line Items]
Term of contract	1 year