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v3.23.3

PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 03, 2023 USD ($) | Feb. 14, 2023 USD ($) subsidiary $ / shares | Feb. 10, 2023 USD ($) mi purchaseAgreement a | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciation expense |  |  |  | $ 690 | $ 850 | $ 2,024 | $ 2,529 |
Number of purchase agreements | purchaseAgreement |  |  | 2 |  |  |  |  |
Purchase Agreement, acres to purchase | a |  |  | 37,300 |  |  |  |  |
Purchase Agreement, miles to purchase | mi |  |  | 58.3 |  |  |  |  |
Purchase Agreement, purchase price |  |  | $ 27,500 |  |  |  |  |
Purchase Agreement, payment due at closing |  |  | 21,600 |  |  |  |  |
Purchase Agreement, deposit payment |  |  | 5,900 |  |  |  |  |
Purchase Agreement, direct deal costs |  |  | $ 1,630 |  |  |  |  |
Gain on sale of assets |  |  |  | 0 |  | 119,257 | 0 |
Restricted Cash And Cash Equivalents Held For Sale |  |  |  |  |  | 0 |  | $ 3,590
Plus: release of restricted cash related to sale of assets |  |  |  |  |  | (3,590) | 0 |
Additions to property, plant and equipment |  |  |  |  |  | 8,908 | 1,237 |
Alta Mesa Divestiture |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number Of Subsidiaries Sold | subsidiary |  | 3 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 120,000 |  |  |  |  |  |
Proceeds from Divestiture of Interest in Consolidated Subsidiaries |  | 60,000 |  |  |  |  |  |
Disposal Group, Cash Due Prior To Closing |  | 6,000 |  |  |  |  |  |
Disposal Group, Cash Due At Closing |  | 54,000 |  |  |  |  |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received |  | $ 60,000 |  |  |  |  |  |
Convertible Note Receivable, Term |  | 2 years |  |  |  |  |  |
Convertible Notes Receivable, Interest Rate |  | 8.00% |  |  |  |  |  |
Convertible Notes Receivable, Conversion Price Per Share | $ / shares |  | $ 2.9103 |  |  |  |  |  |
Convertible Notes Receivable, Premium |  | 20.00% |  |  |  |  |  |
Convertible Notes Receivable, Conversion Limitation Per Transaction |  | $ 10,000 |  |  |  |  |  |
Convertible Notes Receivable, Conversion Period |  | 30 days |  |  |  |  |  |
Gain on sale of assets |  | $ 116,500 |  |  |  |  |  |
Disposal Group, Cash To Be Received |  | 119,460 |  |  |  |  |  |
Notes Receivable, Amortized cost |  | 59,460 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets |  | 3,400 |  |  |  |  |  |
Restricted Cash And Cash Equivalents Held For Sale |  | 3,590 |  |  |  |  |  |
Plus: release of restricted cash related to sale of assets |  | $ 3,590 |  |  |  |  |  |
Proceeds from Sale of Productive Assets | $ 3,100 |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | 2,750 |  |  |  |  |  |  |
Additions to property, plant and equipment | 500 |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | $ 350 |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Property, Plant And Equipment, Usage Period | 20 years |  |  |  |  |  |  |
White Mesa Mill |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciation |  |  |  | $ 90 | $ 60 | $ 240 | $ 160 |

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