The element represents common shares confirmed and recognized.

No definition available.

Name:	fnuc_CommonSharesConfirmedAndRecognized
Namespace Prefix:	fnuc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents common shares confirmed and recognized deemed price per share.

+ References

No definition available.

+ Details

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

- Definition

The element represents convertible note indebtedness converted into common shares deemed price per share.

+ References

No definition available.

+ Details

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

- Definition

The element represents convertible note indebtedness converted into common shares issued.

+ References

No definition available.

+ Details

Name:	fnuc_ConvertibleNoteIndebtednessConvertedIntoCommonSharesIssued
Namespace Prefix:	fnuc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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 number of share units redeemed.

+ References

No definition available.

+ Details

Name:	fnuc_NumberOfShareUnitsRedeemed
Namespace Prefix:	fnuc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents number of shares confirmed and recognized debt conversion.

+ References

No definition available.

+ Details

Name:	fnuc_NumberOfSharesConfirmedAndRecognizedDebtConversion
Namespace Prefix:	fnuc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents number of shares confirmed and recognized share based settlement.

+ References

No definition available.

+ Details

Name:	fnuc_NumberOfSharesConfirmedAndRecognizedShareBasedSettlement
Namespace Prefix:	fnuc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents number of treasury shares to be issued debt conversion.

+ References

No definition available.

+ Details

Name:	fnuc_NumberOfTreasurySharesToBeIssuedDebtConversion
Namespace Prefix:	fnuc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents number of treasury shares to be issued share based settlement.

+ References

No definition available.

+ Details

Name:	fnuc_NumberOfTreasurySharesToBeIssuedShareBasedSettlement
Namespace Prefix:	fnuc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents number of vested restricted share units settled.

+ References

No definition available.

+ Details

Name:	fnuc_NumberOfVestedRestrictedShareUnitsSettled
Namespace Prefix:	fnuc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents restricted share unit obligation settled amount.

+ References

No definition available.

+ Details

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

- Definition

The element represents secured promissory note receivable amount.

+ References

No definition available.

+ Details

Name:	fnuc_SecuredPromissoryNoteReceivableAmount
Namespace Prefix:	fnuc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The element represents trade payables settled through issuance of shares amount.

+ References

No definition available.

+ Details

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

- Definition

The description of the non-cash acquisition of an entity by means of an equity issue.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
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-URIDate 2025-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
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
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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 nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-IssueDate 2025-01-01
-Paragraph B10
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-Note Expiry date 2027-01-01
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-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ParValuePerShare
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Total for all joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2025-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
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-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInJointVenture
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of trade payables and other payables. [Refer: Trade payables; Other payables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 54
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-URIDate 2025-03-27

+ Details

Name:	ifrs-full_TradeAndOtherPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=fnuc_SubsequentEventsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfAntidilutiveInstrumentsAxis=ifrs-full_RestrictedShareUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fnuc_ShareIssuanceTrancheAxis=fnuc_TrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fnuc_ShareIssuanceTrancheAxis=fnuc_TrancheTwoMember
Namespace Prefix:
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Subsequent Events (Details Narrative) - USD ($)		1 Months Ended
Subsequent Events (Details Narrative) - USD ($)	Feb. 25, 2026	Feb. 13, 2026	Jun. 30, 2026	Feb. 24, 2026	Jan. 01, 2026	Dec. 31, 2025	Jun. 30, 2025	Jan. 27, 2025	Jan. 10, 2025	Dec. 31, 2024	Dec. 20, 2024	Nov. 18, 2024	Aug. 07, 2024
IfrsStatementLineItems [Line Items]
Shares issued for RSUs obligation settlement						18,026,269	1,009,919	1,230,769	38,461	1,442,307	1,211,538	76,923	155,730
Subsequent Events [Member]
IfrsStatementLineItems [Line Items]
Acquisition of remaining		80.30%
Shares issued for RSUs obligation settlement	500,000	6,671,018	25,489
Description of acquisition		The Company also issued 393,108 warrants exercisable at US$4.8185 per share until April 21, 2028, and 522,519 warrants exercisable at US$5.5598 per share until May 14, 2027, in replacement of all cancelled GUE options.
Outstanding trade payables settled	$ 1,000,000
Common shares confirmed and recognized			7,098,872
Common shares confirmed and recognized deemed price per share			$ 1.15
RSUs obligation settled			$ 29,313
Vested RSUs settled			7,500
Deemed price per share			$ 1.15
Shares issued for RSUs obligation settlement confirmed and recognized			13,055
Shares issued for RSUs obligation settlement to be issued from treasury			12,434
Convertible note indebtedness converted into common shares issued			3,810,030
Convertible note indebtedness converted into common shares deemed price per share			$ 1.15
Convertible note indebtedness converted satisfied through confirmation and recognition			3,589,832
Convertible note indebtedness converted to be issued from treasury			220,198
Secured promissory note owing to the Company			$ 5,629,205
Subsequent Events [Member] \| Restricted share units [member]
IfrsStatementLineItems [Line Items]
RSUs redeemed					131,792
Cash equivalent amount payable					$ 499,955
Subsequent Events [Member] \| Tranche One [Member]
IfrsStatementLineItems [Line Items]
Shares issued for RSUs obligation settlement				100,000
Subsequent Events [Member] \| Tranche Two [Member]
IfrsStatementLineItems [Line Items]
Shares issued for RSUs obligation settlement	400,000