Amount of payment by third party to acquire net smelter returns royalty.

No definition available.

Name:	NEXM_AmountOfPaymentByThirdPartyToAcquireNetSmelterReturnsRoyalty
Namespace Prefix:	NEXM_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of payment due to liquidator upon repurchase of net smelter royalty option.

+ References

No definition available.

+ Details

Name:	NEXM_AmountOfPaymentDueToLiquidatorUponRepurchaseOfNetSmelterRoyaltyOption
Namespace Prefix:	NEXM_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of call option.

+ References

No definition available.

+ Details

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Namespace Prefix:	NEXM_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of net smelter returns royalty retained by liquidator.

+ References

No definition available.

+ Details

Name:	NEXM_PercentageOfNetSmelterReturnsRoyaltyRetainedByLiquidator
Namespace Prefix:	NEXM_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Repurchase option percentage of net smelter returns royalty.

+ References

No definition available.

+ Details

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Namespace Prefix:	NEXM_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

+ Details

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

- Definition

The cash outflow from amounts paid for the rights to manage the property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=NEXM_SelebiMinesAndSelkirkMineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=NEXM_SelebiMinesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=NEXM_SelkirkMineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=NEXM_PremiumNickelGroupProprietaryLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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Namespace Prefix:
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- Details

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NSR OPTION (Details Narrative)	6 Months Ended		12 Months Ended
NSR OPTION (Details Narrative)	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CAD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2025 CAD ($)	Aug. 31, 2022 USD ($)	Aug. 31, 2022 CAD ($)	Jan. 31, 2022 USD ($)	Jan. 31, 2022 CAD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Fair value of call option
Cymbria [Member] \| Selebi Mines And Selkirk Mine [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royality percentage		0.50%
Cymbria [Member] \| Selebi Mines [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Mine payments	$ 8,102,500	$ 11,513,653
Cymbria [Member] \| Selkirk Mine [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Mine payments	$ 810,250	$ 1,151,365
Premium Nickel Group Proprietary Limited [Member] \| Cymbria [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royality percentage		0.50%
Contractual Rights Option Arrangement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payment to acquire rights			$ 2,750,000
Contractual Rights Option Arrangement [Member] \| Cymbria [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Fair value of call option
Contractual Rights Option Arrangement [Member] \| Premium Nickel Resources Proprietary Limited [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payment to acquire rights			2,500,000
Contractual Rights Option Arrangement [Member] \| Premium Nickel Group Proprietary Limited [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payment to acquire rights			$ 250,000
Selebi Net Smelter Return [Member] \| Premium Nickel Resources Proprietary Limited [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of net smelter returns royalty retained							2.00%	2.00%
Repurchase of net smelter royalty option							$ 20,000,000	$ 28,420,000
Selkirk Net Smelter Return [Member] \| Premium Nickel Group Proprietary Limited [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of net smelter returns royalty retained					1.00%	1.00%
Repurchase of net smelter royalty option					$ 2,000,000	$ 2,842,000