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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule Of Income Taxes [Line Items] |  |  |  |
Income (loss) before income taxes for foreign operations | $ 7,700 | $ 1,200 | $ 1,500 |
Effective income tax (as a percent) | 29.50% | 29.20% | 27.20% |
Valuation allowance | $ 7,036 | $ 6,153 |  |
Goodwill amortized period |  | 15 years |  |
Unrecognized tax benefits | 1,072 | $ 343 | $ 212 | $ 1,079
Net change in total valuation allowance | 1,000 |  |  |
Additions for tax positions of prior years | 729 | 343 | 212 |
Unrecognized tax benefit that would impact tax rate | 847 | 271 |  |
Unrecognized tax benefits, penalties and interest tax expense | 173 | 164 | $ 227 |
Income tax-related interest payable | 214 | $ 41 |  |
State and Local Jurisdiction |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | 700 |  |  |
Oppenheimer Israel (OPCO) Ltd. |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | 2,400 |  |  |
Oppenheimer Europe Ltd |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Valuation allowance | $ 5,400 |  |  |

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