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The change in the fair value of the Contingent Consent Warrants is presented below: (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2023 USD ($)
Debt Disclosure [Abstract]
Initial valuation, at beginning	$ 1,221
Change in valuation	489
Valuation, at ending	$ 1,710

X

- Definition

The element represents change in valuation of warrants.

+ References

No definition available.

+ Details

Name:	niobf_ChangeInValuationOfWarrants
Namespace Prefix:	niobf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

Name:	us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant