The element represents fair value of shares granted to directors and committee members.

No definition available.

Name:	fnuc_FairValueOfSharesGrantedToDirectorsAndCommitteeMembers
Namespace Prefix:	fnuc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The element represents fair value of shares issued as consideration for acquisition.

+ References

No definition available.

+ Details

Name:	fnuc_FairValueOfSharesIssuedAsConsiderationForAcquisition
Namespace Prefix:	fnuc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The element represents fair value of shares issued for debt settlement.

+ References

No definition available.

+ Details

Name:	fnuc_FairValueOfSharesIssuedForDebtSettlement
Namespace Prefix:	fnuc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	fnuc_IfrsStatementLineItems
Namespace Prefix:	fnuc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The element represents maximum aggregate offering amount under a t m facility.

+ References

No definition available.

+ Details

Name:	fnuc_MaximumAggregateOfferingAmountUnderATMFacility
Namespace Prefix:	fnuc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The element represents public offering price per share.

+ References

No definition available.

+ Details

Name:	fnuc_PublicOfferingPricePerShare
Namespace Prefix:	fnuc_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents share issue amount.

+ References

No definition available.

+ Details

Name:	fnuc_ShareIssueAmount
Namespace Prefix:	fnuc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 106
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-URIDate 2025-03-27

+ Details

Name:	ifrs-full_NumberOfSharesIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 160
-Subparagraph a
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B10_a_iv&doctype=Appendix&subtype=B
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
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-URIDate 2025-03-27

+ Details

Name:	ifrs-full_NumberOfSharesOutstanding
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for share issue costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
-Paragraph 17
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_17&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_PaymentsForShareIssueCosts
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from issuing shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
-Paragraph 17
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_17_a&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ProceedsFromIssuingShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fnuc_ATMSalesAgreementWithThinkEquityLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fnuc_DebtSettlementTo10183923ManitobaLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fnuc_DebtSettlementTo10152300ManitobaLTDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fnuc_DebtSettlementTo10223254ManitobaLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fnuc_DebtSettlementTo10223778ManitobaLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fnuc_DirectorsAndCommitteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=fnuc_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Share Capital (Details Narrative)	1 Months Ended			2 Months Ended	6 Months Ended		12 Months Ended
Share Capital (Details Narrative)	Jan. 27, 2025 CAD ($)	Dec. 31, 2024 CAD ($)	Dec. 20, 2024 CAD ($)	Oct. 18, 2024 USD ($)	Dec. 31, 2025 CAD ($) shares	Dec. 31, 2024 CAD ($)	Jun. 30, 2025 CAD ($) shares	May 02, 2025 shares	May 01, 2025 shares	Apr. 17, 2025 USD ($)	Mar. 13, 2025 shares	Mar. 12, 2025 CAD ($) shares	Feb. 28, 2025 CAD ($) shares	Jan. 27, 2025 $ / shares shares	Jan. 10, 2025 CAD ($) shares	Dec. 31, 2024 $ / shares shares	Dec. 20, 2024 $ / shares shares	Nov. 18, 2024 CAD ($) shares	Aug. 07, 2024 CAD ($) shares
IfrsStatementLineItems [Line Items]
Shares outstanding after the reverse split \| shares					15,503,350			7,800,497	101,406,557
Maximum Aggregate Offering Amount Under ATM Sales Agreement										$ 50,000,000
Common shares issued to CEO upon exercise of RSUs \| shares					18,026,269		1,009,919							1,230,769	38,461	1,442,307	1,211,538	76,923	155,730
Gross proceeds from shares issuance	$ 23,009,600	$ 21,583,500	$ 9,276,199		$ 50,685,642		$ 5,323,724
Fees and expenses for marketing, commissions, and professional services					$ 9,917,786	$ 2,744,501	$ 16,672,731
Fair value of shares issued as consideration for acquisition																			$ 1,490,860
ATM facility maximum authorized issuance				$ 2,900,000
Public offering price per share \| $ / shares														$ 13.00		$ 10.40	$ 5.33
Fair value of shares issued for debt settlement															$ 489,627			$ 308,924
Fair value of shares granted to directors and committee members															$ 88,120
ATM Sales Agreement with ThinkEquity LLC [Member]
IfrsStatementLineItems [Line Items]
Common shares issued to CEO upon exercise of RSUs \| shares					6,755,183
Fees and expenses for marketing, commissions, and professional services					$ 9,269,409
Debt Settlement To One Zero One Eight Three Nine Two Three Manitoba Ltd [Member]
IfrsStatementLineItems [Line Items]
Common shares issued to CEO upon exercise of RSUs \| shares													378,461
Fair value of shares issued for debt settlement													$ 5,358,848
Debt Settlement To One Zero One Five Two Three Zero Zero Manitoba Ltd [Member]
IfrsStatementLineItems [Line Items]
Common shares issued to CEO upon exercise of RSUs \| shares													38,461
Fair value of shares issued for debt settlement													$ 544,598
Debt Settlement To One Zero Two Two Three Two Five Four Manitoba Ltd [Member]
IfrsStatementLineItems [Line Items]
Common shares issued to CEO upon exercise of RSUs \| shares												123,076
Fair value of shares issued for debt settlement												$ 838,126
Debt Settlement To One Zero Two Two Three Seven Seven Eight Manitoba Ltd [Member]
IfrsStatementLineItems [Line Items]
Common shares issued to CEO upon exercise of RSUs \| shares											121,153
Fair value of shares issued for debt settlement												$ 785,213
Directors And Committee [Member]
IfrsStatementLineItems [Line Items]
Common shares issued to CEO upon exercise of RSUs \| shares															6,923
Chief Executive Officer [Member]
IfrsStatementLineItems [Line Items]
Common shares issued to CEO upon exercise of RSUs \| shares															7,692