Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 126
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_126_a&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 129
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_129_a&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 250
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_250_a&doctype=Standard
-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 250
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_250_a&doctype=Standard
-URIDate 2025-03-27

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

- Definition

Amount paid for stake claims for exploration and evaluation assets.

+ References

No definition available.

+ Details

Name:	isou_AcquisitionCostOfStakeClaimsForExplorationAndEvaluationAssets
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount spent to stake property extensions for exploration and evaluation assets.

+ References

No definition available.

+ Details

Name:	isou_AcquisitionCostToStakePropertyExtensions
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of advances to joint venture, net of exploration and evaluation costs.

+ References

No definition available.

+ Details

Name:	isou_AdvancesToJointVentureNetOfExplorationAndEvaluationCosts
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying amount of assets sold.

+ References

No definition available.

+ Details

Name:	isou_CarryingAmountOfAssetsSold
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	isou_DisclosureOfDetailedInformationAboutExplorationAndEvaluationAssetsLineItems
Namespace Prefix:	isou_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of estimated fair value of asset after impairment write down.

+ References

No definition available.

+ Details

Name:	isou_EstimatedFairValueAfterImpairmentWriteDown
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase in contingent payments pursuant to exploration and evaluation assets as a part of non-cash transaction.

+ References

No definition available.

+ Details

Name:	isou_NonCashTransactionIncreaseInContingentPaymentsAcquisitionOfExplorationAndEvaluationAssets
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of interest held in the property.

+ References

No definition available.

+ Details

Name:	isou_ProportionOfInterestInPropertyHeldPercent
Namespace Prefix:	isou_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of shares received in exchange of ownership interest in joint venture.

+ References

No definition available.

+ Details

Name:	isou_ProportionOfOwnershipInterestInJointVentureExchangedSharesReceived
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of proportionate share of joint venture exploration and evaluation expenditures.

+ References

No definition available.

+ Details

Name:	isou_ProportionateShareOfJointVentureExplorationAndEvaluationExpenditures
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount spent for purchase of outstanding shares.

+ References

No definition available.

+ Details

Name:	isou_PurchaseOfOutstandingShares
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of fair value of shares issued for acquiring exploration and evaluation assets.

+ References

No definition available.

+ Details

Name:	isou_SharesIssuedForAcquiringExplorationAndEvaluationAssetFairValue
Namespace Prefix:	isou_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of shares issued in lieu of cash for exploration and evaluation asset.

+ References

No definition available.

+ Details

Name:	isou_StockIssuedDuringPeriodSharesIssuedForExplorationAndEvaluationAsset
Namespace Prefix:	isou_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=isou_BulyeaRiverPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=isou_RadioAndCarlsonCreekPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=isou_RadioPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=isou_CarlsonCreekPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_JointOperationsAxis=isou_PurepointJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

EXPLORATION AND EVALUATION ASSETS - Narrative (Details) - CAD ($)		12 Months Ended
	Feb. 14, 2025	Dec. 31, 2025	Dec. 31, 2024
EXPLORATION AND EVALUATION ASSETS
Advances to Purepoint Joint Venture		$ 1,062,483	$ 0
Proportionate share of costs incurred for Purepoint Joint Venture		$ 351,033	$ 0
Shares issued for exploration and evaluation asset (in shares)		16,666
Fair value of shares issued for acquiring exploration and evaluation assets		$ 161,160
Interest in Bulyea River property		100.00%	100.00%
Cost of stake claims		$ 2,630	$ 408,449
Non-cash increase to contingent payments on acquisition of exploration and evaluation assets			278,152
Value of outstanding common shares purchased			163,887
Cost of staking property extensions			5,771
Value of shares received in exchange for interest in Purepoint Joint Venture		1,060,000
Exploration and evaluation assets derecognized on sale	$ 151,010	151,010
Disposals and impairment of assets		935,814	39,958,977
Bulyea River property
EXPLORATION AND EVALUATION ASSETS
Disposals and impairment of assets		935,814
Radio and Carlson Creek properties
EXPLORATION AND EVALUATION ASSETS
Disposals and impairment of assets			14,342,736
Radio property
EXPLORATION AND EVALUATION ASSETS
Estimated fair value			365,268
Carlson property
EXPLORATION AND EVALUATION ASSETS
Estimated fair value			335,501
Purepoint Uranium
EXPLORATION AND EVALUATION ASSETS
Advances to Purepoint Joint Venture		$ 6,362,483	6,360,000
Disposals and impairment of assets			$ 25,616,241