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INVESTMENTS ACCOUNTED FOR AT FAIR VALUE (Details) $ / shares in Units, $ in Thousands, $ in Thousands, $ in Thousands |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 05, 2023 shares | Nov. 29, 2023 AUD ($) shares | Oct. 19, 2023 CAD ($) $ / shares shares | Jan. 24, 2023 shares | Oct. 27, 2021 | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Change In Value Of Investments Accounted At Fair Value | $ |  |  |  |  |  | $ 15,472 |  |
Investments (Note 6) | $ |  |  |  |  |  | 1,356 | $ 19,329 |
Business Acquisition, Number Of Common Stock Shares Acquired | 8,501,424 |  |  |  |  |  |  |
Consolidated Uranium Inc. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Percentage of fair value investment |  |  |  |  | 19.90% |  | 17.40% |
Virginia Uranium, Inc. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Percentage of fair value investment |  |  |  |  |  |  | 13.50% |
Consolidated Uranium Inc. And Virginia Energy |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Change In Value Of Investments Accounted At Fair Value | $ |  |  |  |  |  | 4,980 | $ (16,808) | $ 6,311
IsoEnergy Ltd. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Business Combination, Number of Common Stock Shares Acquired |  |  | 406,650 |  |  |  |  |
Tate Transition Metals Ltd |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Percentage of fair value investment |  | 19.90% |  |  |  |  |  |
Subscription Agreement, Shares Issued |  | 199,000 |  |  |  |  |  |
Subscription Agreement, Purchase Price | $ |  | $ 1,990 |  |  |  |  |  |
IsoEnergy Ltd. | Private Placement |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 8,134,500 |  |  |  |  |
Sale of stock, price per share (in USD per share) | $ / shares |  |  | $ 4.50 |  |  |  |  |
Virginia Uranium, Inc. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Shares Converted |  |  |  | 16,189,548 |  |  |  |
Virginia Uranium, Inc. | CUR |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00% |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share |  |  |  | 0.26 |  |  |  |
Business Combination, Number of Common Stock Shares Acquired |  |  |  | 9,439,857 |  |  |  |
Business Combination, Acquired Shares Converted To Common Stock |  |  |  | 2,454,362 |  |  |  |
Virginia Uranium, Inc. | IsoEnergy Ltd. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share | 0.500 |  |  |  |  |  |  |
IsoEnergy Ltd. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Total purchase price | $ |  |  | $ 1,830 |  |  |  |  |
CUR |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 5.00% |  |  | 16.70% |  |  |  |
Level 1 | Consolidated Uranium Inc. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Investments accounted for at fair value | $ |  |  |  |  |  | 23,630 | 16,500 |
Level 1 | Virginia Uranium, Inc. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Investments accounted for at fair value | $ |  |  |  |  |  | $ 3,390 | $ 2,830 |

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