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v3.24.3

Schedule of warrant transactions (Details) | 3 Months Ended
--- | ---
Sep. 30, 2024 $ / shares shares
Equity [Abstract] |
Beginning balance | 18,563,561
Beginning balance | $ / shares | $ 10.53
Granted | 2,816,742
Granted | $ / shares | $ 2.31
Exercised |
Exercised |
Expired | (447,318)
Expired | $ / shares | $ 8.94
Ending balance | 20,932,985
Ending balance | $ / shares | $ 9.46

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 Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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