Cover - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2025 |
Sep. 11, 2025 |
Dec. 31, 2024 |
|
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Jun. 30, 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2025 | ||
| Current Fiscal Year End Date | --06-30 | ||
| Entity File Number | 001-41655 | ||
| Entity Registrant Name | NioCorp Developments Ltd. | ||
| Entity Central Index Key | 0001512228 | ||
| Entity Tax Identification Number | 98-1262185 | ||
| Entity Incorporation, State or Country Code | A1 | ||
| Entity Address, Address Line One | 7000 South Yosemite Street | ||
| Entity Address, Address Line Two | Suite 115 | ||
| Entity Address, City or Town | Centennial | ||
| Entity Address, State or Province | CO | ||
| Entity Address, Postal Zip Code | 80112 | ||
| City Area Code | (720) | ||
| Local Phone Number | 334-7066 | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 62,900,000 | ||
| Entity Common Stock, Shares Outstanding | 77,757,089 | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Auditor Opinion [Text Block] | We have audited the accompanying consolidated balance sheet of NioCorp Developments Ltd. and subsidiaries (the “Company”) as of June 30, 2025 and 2024, the related consolidated statements of operations and comprehensive loss, cash flows, and shareholders’ equity and redeemable noncontrolling interest, for the each of the two years in the period ended June 30, 2025, the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of June 30, 2025 and 2024, and the results of its operations and its cash flows for each of the two years in the period ended June 30, 2025 in conformity with accounting principles generally accepted in the United States of America. | ||
| Auditor Location | Denver, Colorado | ||
| Auditor Name | DELOITTE & TOUCHE LLP | ||
| Auditor Firm ID | 34 | ||
| Common Shares Without Par Value [Member] | |||
| Title of 12(b) Security | Common Shares, without par value | ||
| Trading Symbol | NB | ||
| Security Exchange Name | NASDAQ | ||
| Warrants Each Exercisable For111829212 [Member] | |||
| Title of 12(b) Security | Warrants, each exercisable for 1.11829212 Common Shares | ||
| Trading Symbol | NIOBW | ||
| Security Exchange Name | NASDAQ |