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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Income Taxes [Line Items] |  |  |  |
Income (loss) before income taxes for foreign operations | $ 4,800 | $ 7,700 | $ 1,200 |
Effective income tax (as a percent) | 35.30% | 29.50% | 29.20% |
Net change in total valuation allowance | $ 3,400 |  |  |
Unrecognized tax benefits | 1,236 | $ 1,072 | $ 343 | $ 212
Additions for tax positions of prior years | 224 | 729 | 343 |
Settlements with taxing authorities | (60) | 0 | (212) |
Unrecognized tax benefit that would impact tax rate | 977 | 847 |  |
Unrecognized tax benefits, penalties and interest tax expense | 107 | 173 | $ 164 |
Income tax-related interest payable | 322 | $ 214 |  |
Oppenheimer Israel (OPCO) Ltd. |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | 2,000 |  |  |
Oppenheimer Europe Ltd |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 8,600 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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