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v3.23.3

Weighted average exercise prices related to Canadian dollar denominated warrants were converted to U.S. dollars using end of period foreign currency exchange rates. (Details) - $ / shares | 12 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Equity [Abstract] |  |  |
Balance at beginning | 1,851,622 | 1,434,183 | 1,237,645
Balance at beginning average price | $ 8.99 | $ 9.36 | $ 5.43
Nordmin warrants |  |  | 50,000
Nordmin warrants average price |  |  | $ 6.45
Lind III Warrants |  |  | 855,800
Lind III warrants average price |  |  | $ 7.83
April 2021 private placement |  |  | 441,211
April 2021 private placement average price |  |  | $ 13.15
Exercised |  | (87,175) | (910,628)
Exercised average price | $ 11.67 | $ 6.05 | $ 6.05
Expired | (491,211) |  | (239,845)
Expired average price |  |  | $ 5.89
June 2022 private placement |  | 504,614 |
June 2022 private placement average price |  | $ 8.54 |
Yorkville financing warrants | 1,789,267 |  |
Yorkville financing warrants average price | $ 8.94 |  |
GXII warrants | 15,666,626 |  |
GXII warrant average price | $ 11.50 |  |
Balance at ending | 18,816,304 | 1,851,622 | 1,434,183
Balance at ending average price | $ 10.98 | $ 8.99 | $ 9.36

X
- Definition The element represents class of warrant or right april private placement. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightAprilPrivatePlacement
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 april private placements. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceAprilPrivatePlacements
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 exercised. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceExercised
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 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 june private placements. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceJunePrivatePlacements
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 lind warrants. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceLindWarrants
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 warrants gxii warrants. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceWarrantsGXIIWarrants
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 warrants november financing. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceWarrantsNovemberFinancing
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 warrants yorkville financing warrants. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightExercisePriceWarrantsYorkvilleFinancingWarrants
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 june private placement. + References No definition available. + Details
Name: | niobf_ClassOfWarrantOrRightJunePrivatePlacement
Namespace Prefix: | niobf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The element represents gxii warrants. + References No definition available. + Details
Name: | niobf_GxiiWarrants
Namespace Prefix: | niobf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents nordmin warrants. + References No definition available. + Details
Name: | niobf_NordminWarrants
Namespace Prefix: | niobf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents yorkville financing warrants. + References No definition available. + Details
Name: | niobf_YorkvilleFinancingWarrants
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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + 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