XML 124 R66.htm IDEA: XBRL DOCUMENT
v3.24.3

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, 2024 | Jun. 30, 2023
Equity [Abstract] |  |
Beginning balance | 18,816,304 | 1,851,622
Balance at beginning average price | $ 10.98 | $ 8.99
Yorkville financing warrants |  | 1,789,267
Yorkville financing warrants average price |  | $ 8.94
GXII warrants |  | 15,666,626
GXII warrant average price |  | $ 11.50
Class of Warrant or Right Expired | (1,846,560) | (491,211)
Cancelled | $ 8.67 | $ 11.67
Granted | 1,593,817 |
Granted | $ 3.33 |
Ending balance | 18,563,561 | 18,816,304
Balance at ending average price | $ 10.53 | $ 10.98

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 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 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 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 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 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 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -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