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Note 12 - Trade and Other Receivables - Summary of Movements in Carrying Amount of Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Trade and other receivables [line items] |  |
Current receivables from sale of investments |  | $ 32,797
Star X [member] |  |
Trade and other receivables [line items] |  |
Interest income | $ 165 | 1,556
Dividend set-off | (32,962) | (25,133)
Star X [member] | Carrying value [member] |  |
Trade and other receivables [line items] |  |
Carrying amount as of January 1 | 32,797 | 56,374
Carrying amount as of December 31 | $ 0 | $ 32,797

X
- Definition The amount of interest recognised as a receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_InterestReceivable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow from sales of investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of current receivables from sale of investments. + References No definition available. + Details
Name: | opra_CurrentReceivablesFromSaleOfInvestments
Namespace Prefix: | opra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents net receivables from sale of investments. + References No definition available. + Details
Name: | opra_NetReceivablesFromSaleOfInvestments
Namespace Prefix: | opra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Trade and other receivables. + References No definition available. + Details
Name: | opra_TradeAndOtherReceivablesLineItems
Namespace Prefix: | opra_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | ifrs-full_MeasurementAxis=opra_CarryingValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |