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SUBSEQUENT EVENTS (Details Narrative) - USD ($) | Dec. 01, 2024 | Nov. 13, 2024 | Nov. 12, 2024 | Nov. 04, 2024 | Nov. 04, 2024 | Oct. 03, 2024 | Oct. 01, 2024 | Sep. 01, 2024 | Sep. 30, 2024
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Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 1,176,000,000 |  |  |  |  |  | $ 1,176,000 | $ 1,176,000,000 |
Increased the amounts due |  |  |  |  |  |  | $ 336,000 | $ 336,000,000 |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 459,000
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Subsequent event, description |  | On November 13, 2024, the Company closed the November 2024 Private Offering, pursuant to binding subscription agreements with certain accredited investors as part of a non-brokered private placement of 2,199,602 units of the Company (the “Units”). Each Unit consists of one Common Share, one Warrant (collectively, the “Series A Private Warrants”) to purchase one Common Share and one-half of one Warrant to purchase one-half of one Common Share (collectively, the “Series B Private Warrants”). Each Unit was issued and sold at a price of $1.57. The gross proceeds of the November 2024 Private Offering were approximately $3,500 before deducting offering expenses. Certain directors and officers of the Company purchased November 2024 Units at a price of $1.7675 per Unit, which price includes $0.125 per Private Warrant and allows such directors and officers to participate in the November 2024 Private Offering in accordance with the rules of the Nasdaq. The Series A Private Warrants have an exercise price of $1.75 per underlying Common Share, are exercisable immediately, and will expire on November 13, 2026. |  |  | On November 5, 2024, the Company closed the November 2024 Registered Offering, pursuant to the underwriting agreement, dated November 3, 2024 (the “Underwriting Agreement”), with Maxim Group LLC, as underwriter (the “Underwriter”), which consisted of 1,592,356 Common Shares, 1,672,090 Warrants (the “Series A Public Warrants”) to purchase up to an additional 1,672,090 Common Shares and 836,045 Warrants (the “Series B Public Warrants” and, together with the Series A Public Warrants, the “November Public Warrants”) to purchase up to an additional 836,045 Common Shares. Each Common Share was sold together with one Series A Public Warrant and one-half of one Series B Public Warrant at a combined public offering price of $1.57. The gross proceeds from the November 2024 Registered Offering were approximately $2,500 before deducting underwriting discounts and offering expenses. The Company entered into a warrant agency agreement with Computershare Inc. and its affiliate, Computershare Trust Company, N.A., together as warrant agent, setting forth the terms and conditions of the November Public Warrants. The Series A Public Warrants have an exercise price of $1.75 per underlying Common Share, are exercisable immediately, and will expire on November 5, 2026. The Series B Public Warrants have an exercise price of $2.07 per underlying Common Share, are exercisable beginning six months and one day from the date of issuance, and will expire on November 5, 2029. In addition, pursuant to the Underwriting Agreement, the Company granted the Underwriter a 45-day over-allotment option to purchase (i) 238,853 additional Common Shares and (ii) 358,280 Option Warrants (as defined below) to purchase up to an aggregate of 358,280 Common Shares. “Option Warrant” means one Series A Public Warrant combined with one-half of one Series B Public Warrant. | On October 3, 2024, NioCorp entered into (i) a consent and waiver (the “October Yorkville Consent”) to the April 2024 Notes issued and sold to Yorkville pursuant to the April 2024 Purchase Agreement and (ii) a consent and waiver (together with the October Yorkville Consent, the “October Consents”) to the April 2024 Notes issued and sold to Lind II pursuant to the April 2024 Purchase Agreement. The October Consents, among other things, extended the maturity date to January 31, 2025, reduced the amounts due to the April 2024 Purchasers on October 1, 2024 by an aggregate of $1,176 to an aggregate of $336 and deferred such amounts due to the April 2024 Purchasers until January 1, 2025, and prospectively waived any term of the April 2024 Notes that would otherwise be triggered upon a failure of the Company to pay to the April 2024 Purchasers the remainder of the amount due on October 1, 2024. Except as modified by the September Consents, as discussed in Note 5b, and the October Consents, the terms of the April 2024 Notes as previously disclosed are unchanged. |  |  |
Exercise price |  |  | $ 2.07 |  |  |  |  |  |
Subsequent Event [Member] | Purchase Agreement Series A [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 79,734 |  |  |  |  |
Subsequent Event [Member] | Purchase Agreement Series B [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 39,867 |  |  |  |  |

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