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PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details) |  |  |  |  |  |  | 12 Months Ended
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May 03, 2023 USD ($) | Feb. 14, 2023 USD ($) subsidiary $ / shares | Feb. 10, 2023 USD ($) purchaseAgreement | May 19, 2022 USD ($) mi mineralConcession a | Nov. 22, 2021 USD ($) $ / shares shares | Oct. 27, 2021 USD ($) shares | Oct. 27, 2021 CAD ($) $ / shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Depletion, depreciation and amortization |  |  |  |  |  |  |  | $ 2,751,000 | $ 3,269,000 | $ 3,189,000
Number Of Purchase Agreements | purchaseAgreement |  |  | 2 |  |  |  |  |  |  |
Purchase Agreements, Number Of Mineral Concessions Acquired | mineralConcession |  |  |  | 17 |  |  |  |  |  |
Purchase Agreement, Acres To Purchase | a |  |  |  | 37,300 |  |  |  |  |  |
Purchase Agreement, Miles To Purchase | mi |  |  |  | 58.3 |  |  |  |  |  |
Purchase Agreement, Purchase Price |  |  |  | $ 27,500,000 |  |  |  |  |  |
Purchase Agreement, Deposit Payment |  |  |  | $ 5,900,000 |  |  |  |  |  |
Purchase Agreement, Payment Due At Closing |  |  | $ 21,600,000 |  |  |  |  |  |  |
Purchase Agreement, Direct Deal Costs |  |  |  |  |  |  |  | 1,630,000 |  |
Disposal Group, Shares Received In Transaction | shares |  |  |  |  | 1,875,085 | 11,860,101 |  |  |  |
Disposal Group, Shares Received In Transaction, Price Per Share | $ / shares |  |  |  |  |  |  | $ 2.95 |  |  |
Disposal Group, Production Payment Commitment |  |  |  |  |  |  | $ 5,000,000 |  |  |
Sales and property tax refunds |  |  |  |  |  | $ 35,730,000 |  |  |  |
Settlement of Asset Retirement Obligations Through Noncash Payments, Amount |  |  |  |  |  | 270,000 |  |  |  |
Disposal Group, Warrants Issued | shares |  |  |  |  | 937,542 |  |  |  |  |
Disposal Group, Warrants Issued, Price Per Share | $ / shares |  |  |  |  | $ 4.00 |  |  |  |  |
Disposal Group, Proceeds For Payment Agreement |  |  |  |  | $ 1,970,000 |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  | 119,257,000 | 366,000 | 35,733,000
Less: restricted cash related to assets held for sale |  |  |  |  |  |  |  | $ 0 | $ 3,590,000 | 0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  | Gain on sale of assets |  |
Alta Mesa Divestiture |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Productive Assets | $ 3,100,000 |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 120,000,000 |  |  |  |  |  |  |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received |  | $ 60,000,000 |  |  |  |  |  |  |  |
Convertible Note Receivable, Term |  | 2 years |  |  |  |  |  |  |  |
Convertible Notes Receivable, Conversion Price Per Share | $ / shares |  | $ 2.9103 |  |  |  |  |  |  |  |
Convertible Notes Receivable, Premium |  | 20.00% |  |  |  |  |  |  |  |
Gain on sale of assets |  | $ 116,500,000 |  |  |  |  |  |  |  |
Disposal Group, Cash To Be Received |  | 119,460,000 |  |  |  |  |  |  |  |
Proceeds from Divestiture of Interest in Consolidated Subsidiaries |  | 60,000,000 |  |  |  |  |  |  |  |
Notes Receivable, Amortized cost |  | 59,460,000 |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets |  | 3,400,000 |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | 2,750,000 |  |  |  |  |  |  |  |  |
Payments to Acquire Other Property, Plant, and Equipment | 500,000 |  |  |  |  |  |  |  |  |
Property, plant and equipment, held-for-sale | $ 350,000 |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Property, Plant And Equipment, Usage Period | 20 years |  |  |  |  |  |  |  |  |
Convertible Notes Receivable, Conversion Limitation Per Transaction |  | $ 10,000,000 |  |  |  |  |  |  |  |
Number of subsidiaries sold | subsidiary |  | 3 |  |  |  |  |  |  |  |
Disposal Group, Cash Due Prior To Closing |  | $ 6,000,000 |  |  |  |  |  |  |  |
Disposal Group, Cash Due At Closing |  | $ 54,000,000 |  |  |  |  |  |  |  |
Second Payment |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal Group, Deferred Cash Receivable |  |  |  |  |  |  | 3,000,000 |  |  |
Third Payment |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal Group, Deferred Cash Receivable |  |  |  |  |  |  | $ 3,000,000 |  |  |
Consolidated Uranium Inc. |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Productive Assets |  |  |  |  |  | $ 2,000,000 |  |  |  |
Percentage of fair value investment |  |  |  |  |  | 19.90% |  |  | 17.40% |
Land |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  | $ 100,000 | $ 240,000 | $ 100,000
Alta Mesa |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, held-for-sale |  |  |  |  |  |  |  | $ 8,210,000 |  |

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