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Note 3 - Revenue - Disclosure of Deferred Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Receivables from contracts with customers [abstract] |  |
Deferred revenue as of January 1 | $ 10,272 | $ 995
Deferred during the year | 5,441 | 10,272
Recognized as revenue during the year | (10,272) | (995)
Deferred revenue as of December 31 | $ 5,441 | $ 10,272

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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 105 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_105&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 116 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_116_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ContractLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_ReceivablesFromContractsWithCustomersAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Deferred revenue recognized during the period. + References No definition available. + Details
Name: | opra_DeferredRevenueRecognizedDuringThePeriod
Namespace Prefix: | opra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue deferred during the period. + References No definition available. + Details
Name: | opra_RevenueDeferredDuringThePeriod
Namespace Prefix: | opra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration