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Income Taxes - Additional Information (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Income Taxes [Line Items] |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | $ 227,000 | $ 87,000 |  |
Profit (loss) before income taxes for foreign operations | $ 1,500,000 | $ 4,900,000 | $ 4,000,000.0 |
Effective Income Tax Rate Reconciliation, Percent | 27.20% | 29.30% | 35.60% |
Valuation allowance | $ 5,059,000 | $ 4,368,000 |  |
Goodwill amortized period |  | 15 years |  |
Unrecognized tax benefits | 212,000 | $ 1,079,000 | $ 1,079,000 | $ 1,079,000
Unrecognized tax benefit that would impact tax rate | 167,000 | 853,000 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 0 | 0 | 0 |
Income tax-related interest payable | 205,000 | 432,000 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 1,079,000 | $ 0 | $ 0 |
Unrecognized Tax Benefits Amount Released | 1,100,000 |  |  |
Oppenheimer Israel (OPCO) Ltd. |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | 3,200,000 |  |  |
Oppenheimer Europe [Member] |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Valuation allowance | $ 3,400,000 |  |  |

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