XML 119 R69.htm IDEA: XBRL DOCUMENT
v3.25.2

COMMON SHARES (Details 8) - $ / shares | 12 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Equity [Abstract] |  |
Beginning balance, Warrants | 18,563,561 | 18,816,304
Beginning balance at Weighted Average Exercise Price | $ 10.53 | $ 10.98
Beginning balance, Warrants | 13,553,714 | 1,593,817
Beginning balance at Weighted Average Exercise Price | $ 2.05 | $ 3.33
Beginning balance, Warrants | (1,303,118) | (1,846,560)
Beginning balance at Weighted Average Exercise Price | $ 7.72 | $ 8.67
Beginning balance, Warrants | (828,235) |
Beginning balance at Weighted Average Exercise Price | 1.78 |
Beginning balance, Warrants | 29,985,922 | 18,563,561
Beginning balance at Weighted Average Exercise Price | $ 7.06 | $ 10.53

X
- Definition The element represents class of warrant or right exercise price exercised. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceExercised
Namespace Prefix: | niobf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents class of warrant or right exercise price expired. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceExpired
Namespace Prefix: | niobf_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents class of warrant or right exercise price granted. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceGranted
Namespace Prefix: | niobf_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents class of warrant or right exercised. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercised
Namespace Prefix: | niobf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents class of warrant or right expired. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExpired
Namespace Prefix: | niobf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents class of warrant or right granted. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightGranted
Namespace Prefix: | niobf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant