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COMMON SHARES (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 24, 2024 | Sep. 02, 2023 | Jun. 09, 2023 | Apr. 28, 2023 | Jun. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from equity |  |  |  |  |  | $ 962 |  |  |
Expected life |  |  |  |  |  |  | 5 years | 3 years |
Risk-free rate |  |  |  |  |  |  | 4.25% | 3.30% |
Expected dividend rate |  |  |  |  |  |  | 0.00% | 0.00% |
Outstanding stock options vested |  |  |  |  |  |  | 100.00% |  |
Share based compensation expense |  |  |  |  |  |  | $ 2,881 | $ 1,794 |
Description of warrants |  |  |  |  |  |  | (ii) the last reported sale price of the Common Shares equals or exceeds approximately $16.10 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading days |  |
GXII Public Warrants [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Warrants traded prior to the closing |  |  |  |  |  |  | 9,999,959 |  |
GXII Private Warrants [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Warrants traded prior to the closing |  |  |  |  |  |  | 5,666,667 |  |
Yorkville Equity Facility Financing Agreement [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversion of Stock, New Issuance |  |  | the Company issued 100,000 Common Shares under the Yorkville Equity Facility Financing Agreement (discussed below) in exchange for $488 in cash proceeds. The Company recorded a non-cash operating expense of $13 which represented the difference between the proceeds received and the fair value of the Common Shares issued based on Nasdaq closing price per Common Share on the issuance date. |  |  |  |  |  |
Kingdon Capital Management LLC [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversion of Stock, New Issuance |  |  |  | the Company closed a registered direct offering and issued 314,465 Common Shares for $2,000, before deducting share issuance costs of $172. The Common Shares were sold pursuant to a securities purchase agreement, dated April 26, 2023, between the Company and a fund managed by Kingdon Capital Management, LLC. |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from equity |  |  |  |  | $ 161 | $ 254 | $ 264 |  |
Expected life |  |  |  |  |  | 2 years | 2 years |  |
Risk-free rate |  |  |  |  | 4.73% | 4.85% | 4.33% |  |
Expected volatility |  |  |  |  | 73.92% | 71.63% | 54.80% |  |
Expected dividend rate |  |  |  |  | 0.00% | 0.00% | 0.00% |  |
Description of warrants |  |  |  |  |  |  | Each NioCorp Assumed Warrant entitles the holder to the right to purchase 1.11829212 Common Shares at an exercise price of $11.50 per 1.11829212 Common Shares (subject to adjustments for stock splits, stock dividends, reorganizations, recapitalizations and the like). |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from equity |  |  |  |  | $ 441 | $ 708 | $ 977 |  |
Units issue and sold |  |  |  |  |  |  |  | 81,213 |
Warrants traded prior to the closing |  |  |  |  |  |  | 283,692 |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  | $ 92 |  |
Employee related costs |  |  |  |  |  |  | $ 10 |  |
Private Placement [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from equity | $ 602 |  |  |  |  |  |  |  |
Description of stock transaction | the Company closed a non-brokered private placement (the “June 2024 Private Placement”) of units of the Company (the “June 2024 Units”). A total of 315,000 June 2024 Units were issued at a price per June 2024 Unit of $1.91, for total gross proceeds to the Company of $602. Each June 2024 Unit consists of one Common Share and one Warrant (“June 2024 Warrant”). Each June 2024 Warrant entitles the holder to acquire one Common Share at a price of $2.20 at any time prior to June 24, 2026. Proceeds of the June 2024 Private Placement will be used for continued advancement of the Elk Creek Project and for working capital and general corporate purposes. |  |  |  |  |  |  |  |
Private Placement [Member] | Canada, Dollars |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issue |  | 250,000 |  |  |  |  | 413,432 |  |
Price per unit |  | $ 4.00 |  |  |  |  |  |  |
Gross proceeds |  | $ 1,000 |  |  |  |  | $ 1,290 |  |
Shares price |  | $ 4.60 |  |  |  |  |  |  | $ 3.54
Private Placement [Member] | Canada, Dollars | Director [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares price |  |  |  |  |  |  |  |  | 3.205
Units issue and sold |  |  |  |  |  |  | 138,845 |  |
Private Placement [Member] | Canada, Dollars | Investor [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares price |  |  |  |  |  |  |  |  | $ 3.08
Units issue and sold |  |  |  |  |  |  | 274,587 |  |

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