DISCONTINUED OPERATIONS - Business segments included in discontinued operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of fixed assets	$ (2,665)	$ 729
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING	8,799,190	1,961,086
Uranium And Lithium Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mineral property expenses	$ (2,606)	$ (2,416)
General and administrative expenses	(1,665)	(1,612)
Accretion of asset retirement obligations	(201)	(390)
Depreciation and amortization	(38)	(67)
Impairment of uranium properties	(5,200)	(143)
Interest income	10	65
Gain on sale of fixed assets	21	2
Other income (expense)	17
Net Loss from Discontinued Operations	$ (9,662)	$ (4,561)
LOSS PER SHARE FROM DISCONTINUED OPERATIONS	$ (1.10)	$ (2.33)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING	8,799,190	1,961,086
Discontinued Operations, Held-for-sale or Disposed of by Sale | Uranium And Lithium Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accretion of asset retirement obligations	$ (201)	$ (390)
Depreciation and amortization	(38)	(67)
Discontinued Operations, Held-for-sale | Uranium And Lithium Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of uranium properties	$ (5,200)	$ (143)