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Disclosure - Note 12 - Trade Receivables, Other Receivables, and Prepayments (Tables) Sheet http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments-tables Note 12 - Trade Receivables, Other Receivables, and Prepayments (Tables) Tables http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments 35 false false R36.htm 035 - Disclosure - Note 13 - Lease Liabilities and Other Loans (Tables) Sheet http://www.opera.com/20231231/role/statement-note-13-lease-liabilities-and-other-loans-tables Note 13 - Lease Liabilities and Other Loans (Tables) Tables http://www.opera.com/20231231/role/statement-note-13-lease-liabilities-and-other-loans 36 false false R37.htm 036 - Disclosure - Note 14 - Trade and Other Payables, and Other Current Liabilities (Tables) Sheet http://www.opera.com/20231231/role/statement-note-14-trade-and-other-payables-and-other-current-liabilities-tables Note 14 - Trade and Other Payables, and Other Current Liabilities (Tables) Tables http://www.opera.com/20231231/role/statement-note-14-trade-and-other-payables-and-other-current-liabilities 37 false false R38.htm 037 - Disclosure - Note 15 - Financial Assets and Financial Liabilities (Tables) Sheet http://www.opera.com/20231231/role/statement-note-15-financial-assets-and-financial-liabilities-tables Note 15 - Financial Assets and Financial Liabilities (Tables) Tables http://www.opera.com/20231231/role/statement-note-15-financial-assets-and-financial-liabilities 38 false false R39.htm 038 - Disclosure - Note 16 - Capital and Financial Risk Management (Tables) Sheet http://www.opera.com/20231231/role/statement-note-16-capital-and-financial-risk-management-tables Note 16 - Capital and Financial Risk Management (Tables) Tables http://www.opera.com/20231231/role/statement-note-16-capital-and-financial-risk-management 39 false false R40.htm 039 - Disclosure - Note 17 - Related Parties (Tables) Sheet http://www.opera.com/20231231/role/statement-note-17-related-parties-tables Note 17 - Related Parties (Tables) Tables http://www.opera.com/20231231/role/statement-note-17-related-parties 40 false false R41.htm 040 - Disclosure - Note 2 - Corporate Information and Group Structure (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-2-corporate-information-and-group-structure-details-textual Note 2 - Corporate Information and Group Structure (Details Textual) Details http://www.opera.com/20231231/role/statement-note-2-corporate-information-and-group-structure 41 false false R42.htm 041 - Disclosure - Note 3 - Revenue Information (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-3-revenue-information-details-textual Note 3 - Revenue Information (Details Textual) Details http://www.opera.com/20231231/role/statement-note-3-revenue-information-tables 42 false false R43.htm 042 - Disclosure - Note 3 - Revenue Information - Disaggregation of Revenue (Details) Sheet http://www.opera.com/20231231/role/statement-note-3-revenue-information-disaggregation-of-revenue-details Note 3 - Revenue Information - Disaggregation of Revenue (Details) Details 43 false false R44.htm 043 - Disclosure - Note 3 - Revenue Information - Disclosure of Remaining Performance Obligations (Details) Sheet http://www.opera.com/20231231/role/statement-note-3-revenue-information-disclosure-of-remaining-performance-obligations-details Note 3 - Revenue Information - Disclosure of Remaining Performance Obligations (Details) Details 44 false false R45.htm 044 - Disclosure - Note 4 - Personnel Expenses, Including Share-based Remuneration (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-4-personnel-expenses-including-sharebased-remuneration-details-textual Note 4 - Personnel Expenses, Including Share-based Remuneration (Details Textual) Details http://www.opera.com/20231231/role/statement-note-4-personnel-expenses-including-sharebased-remuneration-tables 45 false false R46.htm 045 - Disclosure - Note 4 - Personnel Expenses, Including Share-based Remuneration - Personnel Expenses (Details) Sheet http://www.opera.com/20231231/role/statement-note-4-personnel-expenses-including-sharebased-remuneration-personnel-expenses-details Note 4 - Personnel Expenses, Including Share-based Remuneration - Personnel Expenses (Details) Details 46 false false R47.htm 046 - Disclosure - Note 4 - Personnel Expenses, Including Share-based Remuneration - Research and Development Expenditure (Details) Sheet http://www.opera.com/20231231/role/statement-note-4-personnel-expenses-including-sharebased-remuneration-research-and-development-expenditure-details Note 4 - Personnel Expenses, Including Share-based Remuneration - Research and Development Expenditure (Details) Details 47 false false R48.htm 047 - Disclosure - Note 4 - Personnel Expenses, Including Share-based Remuneration - RSUs and Option Activities (Details) Sheet http://www.opera.com/20231231/role/statement-note-4-personnel-expenses-including-sharebased-remuneration-rsus-and-option-activities-details Note 4 - Personnel Expenses, Including Share-based Remuneration - RSUs and Option Activities (Details) Details 48 false false R49.htm 048 - Disclosure - Note 4 - Personnel Expenses, Including Share-based Remuneration - Fair Value Measurement (Details) Sheet http://www.opera.com/20231231/role/statement-note-4-personnel-expenses-including-sharebased-remuneration-fair-value-measurement-details Note 4 - Personnel Expenses, Including Share-based Remuneration - Fair Value Measurement (Details) Details 49 false false R50.htm 049 - Disclosure - Note 4 - Personnel Expenses, Including Share-based Remuneration - Compensation of Key Management Personnel (Details) Sheet http://www.opera.com/20231231/role/statement-note-4-personnel-expenses-including-sharebased-remuneration-compensation-of-key-management-personnel-details Note 4 - Personnel Expenses, Including Share-based Remuneration - Compensation of Key Management Personnel (Details) Details 50 false false R51.htm 050 - Disclosure - Note 5 - Other Operating Expenses - Other Expenses (Details) Sheet http://www.opera.com/20231231/role/statement-note-5-other-operating-expenses-other-expenses-details Note 5 - Other Operating Expenses - Other Expenses (Details) Details 51 false false R52.htm 051 - Disclosure - Note 6 - Finance Income and Finance Expenses - Finance Income (Details) Sheet http://www.opera.com/20231231/role/statement-note-6-finance-income-and-finance-expenses-finance-income-details Note 6 - Finance Income and Finance Expenses - Finance Income (Details) Details 52 false false R53.htm 052 - Disclosure - Note 7 - Income Tax (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-7-income-tax-details-textual Note 7 - Income Tax (Details Textual) Details http://www.opera.com/20231231/role/statement-note-7-income-tax-tables 53 false false R54.htm 053 - Disclosure - Note 7 - Income Tax - Summary of Income Tax (Expense) Benefit (Details) Sheet http://www.opera.com/20231231/role/statement-note-7-income-tax-summary-of-income-tax-expense-benefit-details Note 7 - Income Tax - Summary of Income Tax (Expense) Benefit (Details) Details 54 false false R55.htm 054 - Disclosure - Note 7 - Income Tax - Reconciliation of Tax (Expense) Benefit (Details) Sheet http://www.opera.com/20231231/role/statement-note-7-income-tax-reconciliation-of-tax-expense-benefit-details Note 7 - Income Tax - Reconciliation of Tax (Expense) Benefit (Details) Details 55 false false R56.htm 055 - Disclosure - Note 7 - Income Tax - Deferred Tax Assets and Liabilities (Details) Sheet http://www.opera.com/20231231/role/statement-note-7-income-tax-deferred-tax-assets-and-liabilities-details Note 7 - Income Tax - Deferred Tax Assets and Liabilities (Details) Details 56 false false R57.htm 056 - Disclosure - Note 7 - Income Tax - Changes in Deferred Taxes (Details) Sheet http://www.opera.com/20231231/role/statement-note-7-income-tax-changes-in-deferred-taxes-details Note 7 - Income Tax - Changes in Deferred Taxes (Details) Details 57 false false R58.htm 057 - Disclosure - Note 8 - Earnings Per Share (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-8-earnings-per-share-details-textual Note 8 - Earnings Per Share (Details Textual) Details http://www.opera.com/20231231/role/statement-note-8-earnings-per-share-tables 58 false false R59.htm 058 - Disclosure - Note 8 - Earnings Per Share - Income (Loss) Per Share (Details) Sheet http://www.opera.com/20231231/role/statement-note-8-earnings-per-share-income-loss-per-share-details Note 8 - Earnings Per Share - Income (Loss) Per Share (Details) Details 59 false false R60.htm 059 - Disclosure - Note 9 - Property and Equipment (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-9-property-and-equipment-details-textual Note 9 - Property and Equipment (Details Textual) Details http://www.opera.com/20231231/role/statement-note-9-property-and-equipment-tables 60 false false R61.htm 060 - Disclosure - Note 9 - Property and Equipment - Components of Property, Plant and Equipment, Net (Details) Sheet http://www.opera.com/20231231/role/statement-note-9-property-and-equipment-components-of-property-plant-and-equipment-net-details Note 9 - Property and Equipment - Components of Property, Plant and Equipment, Net (Details) Details 61 false false R62.htm 061 - Disclosure - Note 9 - Property and Equipment - Estimated Useful Lives of Property, Plant and Equipment (Details) Sheet http://www.opera.com/20231231/role/statement-note-9-property-and-equipment-estimated-useful-lives-of-property-plant-and-equipment-details Note 9 - Property and Equipment - Estimated Useful Lives of Property, Plant and Equipment (Details) Details 62 false false R63.htm 062 - Disclosure - Note 10 - Goodwill and Intangible Assets (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-10-goodwill-and-intangible-assets-details-textual Note 10 - Goodwill and Intangible Assets (Details Textual) Details http://www.opera.com/20231231/role/statement-note-10-goodwill-and-intangible-assets-tables 63 false false R64.htm 063 - Disclosure - Note 10 - Goodwill and Intangible Assets - Intangible Assets (Details) Sheet http://www.opera.com/20231231/role/statement-note-10-goodwill-and-intangible-assets-intangible-assets-details Note 10 - Goodwill and Intangible Assets - Intangible Assets (Details) Details 64 false false R65.htm 064 - Disclosure - Note 10 - Goodwill and Intangible Assets - Useful Life of Intangible Assets (Details) Sheet http://www.opera.com/20231231/role/statement-note-10-goodwill-and-intangible-assets-useful-life-of-intangible-assets-details Note 10 - Goodwill and Intangible Assets - Useful Life of Intangible Assets (Details) Details 65 false false R66.htm 065 - Disclosure - Note 11 - Investments in Unconsolidated Entities (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-11-investments-in-unconsolidated-entities-details-textual Note 11 - Investments in Unconsolidated Entities (Details Textual) Details http://www.opera.com/20231231/role/statement-note-11-investments-in-unconsolidated-entities-tables 66 false false R67.htm 066 - Disclosure - Note 11 - Investments in Unconsolidated Entities - Gains, Losses and Carrying Amounts of Investments (Details) Sheet http://www.opera.com/20231231/role/statement-note-11-investments-in-unconsolidated-entities-gains-losses-and-carrying-amounts-of-investments-details Note 11 - Investments in Unconsolidated Entities - Gains, Losses and Carrying Amounts of Investments (Details) Details 67 false false R68.htm 067 - Disclosure - Note 11 - Investments in Unconsolidated Entities - Equity Values, Timing and Probabilities (Details) Sheet http://www.opera.com/20231231/role/statement-note-11-investments-in-unconsolidated-entities-equity-values-timing-and-probabilities-details Note 11 - Investments in Unconsolidated Entities - Equity Values, Timing and Probabilities (Details) Details 68 false false R69.htm 068 - Disclosure - Note 11 - Investments in Unconsolidated Entities - Sensitivities Analysis (Details) Sheet http://www.opera.com/20231231/role/statement-note-11-investments-in-unconsolidated-entities-sensitivities-analysis-details Note 11 - Investments in Unconsolidated Entities - Sensitivities Analysis (Details) Details 69 false false R70.htm 069 - Disclosure - Note 12 - Trade Receivables, Other Receivables, and Prepayments (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments-details-textual Note 12 - Trade Receivables, Other Receivables, and Prepayments (Details Textual) Details http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments-tables 70 false false R71.htm 070 - Disclosure - Note 12 - Trade Receivables, Other Receivables, and Prepayments - Trade Receivables, Prepayments and Other Receivables (Details) Sheet http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments-trade-receivables-prepayments-and-other-receivables-details Note 12 - Trade Receivables, Other Receivables, and Prepayments - Trade Receivables, Prepayments and Other Receivables (Details) Details 71 false false R72.htm 071 - Disclosure - Note 12 - Trade Receivables, Other Receivables, and Prepayments - Aging of Trade Receivables (Details) Sheet http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments-aging-of-trade-receivables-details Note 12 - Trade Receivables, Other Receivables, and Prepayments - Aging of Trade Receivables (Details) Details 72 false false R73.htm 072 - Disclosure - Note 12 - Trade Receivables, Other Receivables, and Prepayments - Provision for Impairment of Trade Receivables (Details) Sheet http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments-provision-for-impairment-of-trade-receivables-details Note 12 - Trade Receivables, Other Receivables, and Prepayments - Provision for Impairment of Trade Receivables (Details) Details 73 false false R74.htm 073 - Disclosure - Note 12 - Trade Receivables, Other Receivables, and Prepayments - Receivables (Details) Sheet http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments-receivables-details Note 12 - Trade Receivables, Other Receivables, and Prepayments - Receivables (Details) Details http://www.opera.com/20231231/role/statement-note-12-trade-receivables-other-receivables-and-prepayments-tables 74 false false R75.htm 074 - Disclosure - Note 13 - Lease Liabilities and Other Loans (Details Textual) Sheet http://www.opera.com/20231231/role/statement-note-13-lease-liabilities-and-other-loans-details-textual Note 13 - Lease Liabilities and Other Loans (Details Textual) Details http://www.opera.com/20231231/role/statement-note-13-lease-liabilities-and-other-loans-tables 75 false false R76.htm 075 - Disclosure - Note 13 - Lease Liabilities and Other Loans - Noncurrent and Current (Details) Sheet http://www.opera.com/20231231/role/statement-note-13-lease-liabilities-and-other-loans-noncurrent-and-current-details Note 13 - Lease Liabilities and Other Loans - Noncurrent and Current (Details) Details 76 false false R77.htm 076 - Disclosure - Note 13 - Lease Liabilities and Other Loans - Lease Amounts Included in Financial Statements (Details) Sheet http://www.opera.com/20231231/role/statement-note-13-lease-liabilities-and-other-loans-lease-amounts-included-in-financial-statements-details Note 13 - Lease Liabilities and Other Loans - Lease Amounts Included in Financial Statements (Details) Details 77 false false R78.htm 077 - Disclosure - Note 13 - Lease Liabilities and Other Loans - Changes in Liabilities Arising from Financing Activities (Details) Sheet http://www.opera.com/20231231/role/statement-note-13-lease-liabilities-and-other-loans-changes-in-liabilities-arising-from-financing-activities-details Note 13 - Lease Liabilities and Other Loans - Changes in Liabilities Arising from Financing Activities (Details) Details 78 false false R79.htm 078 - Disclosure - Note 14 - Trade and Other Payables, and Other Current Liabilities - Trade and Other Payables, and Other Current Liabilities (Details) Sheet http://www.opera.com/20231231/role/statement-note-14-trade-and-other-payables-and-other-current-liabilities-trade-and-other-payables-and-other-current-liabilities-details Note 14 - Trade and Other Payables, and Other Current Liabilities - Trade and Other Payables, and Other Current Liabilities (Details) Details 79 false false R80.htm 079 - 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