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The change in the Private Warrants liability is presented below: (Details) - Note Warrant [Member] - USD ($) $ in Thousands | 4 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2024
Subsidiary, Sale of Stock [Line Items] |  |
Initial valuation, at begining | $ 2,987 | $ 3,279
Change in valuation | 292 | (1,926)
Initial valuation, at ending | $ 3,279 | $ 1,353

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- Definition The element represents changes in fair value of initial valuation. + References No definition available. + Details
Name: | niobf_ChangesInFairValueOfInitialValuation
Namespace Prefix: | niobf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase (decrease) in fair value from changes in the inputs used to calculate the fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(4)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-3 + Details
Name: | us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_NoteWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |