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Note 11 - Investments in Unconsolidated Entities - Summary of Reconciliation of Carrying Amounts of Investments (Details) - OPay Digital Services Limited [member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of unconsolidated structured entities [line items] |  |
Carrying amount, balance | $ 253,300 | $ 86,100
Shares acquired recognized at fair value | 0 | 77,362
Fair value gain on investment | 5,000 | 89,838
Carrying amount, balance | $ 258,300 | $ 253,300

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- 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: | ifrs-full_DisclosureOfUnconsolidatedStructuredEntitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The gains (losses) including exchange differences, recognised in profit or loss, on the fair value measurement of the associates equity instruments. + References No definition available. + Details
Name: | opra_GainsLossesRecognisedInProfitOrLossIncludingExchangeDifferencesFairValueMeasurementAssociatesEquity
Namespace Prefix: | opra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of increase (decrease) in investments in financial assets due to acquisition of shares. + References No definition available. + Details
Name: | opra_IncreaseDecreaseInInvestmentsInFinancialAssetsDueToAcquisitionOfShares
Namespace Prefix: | opra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Investments in financial asset. + References No definition available. + Details
Name: | opra_InvestmentsInFinancialAsset
Namespace Prefix: | opra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=opra_OPayDigitalServicesLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |