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Goodwill and Intangible Assets, Net (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | [1]
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 1,989,000 | $ 1,989,000
Weighted average amortization period | 4 years 10 months 25 days |
Weeden Prime Services LLC [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 1,989,000 |
Customer Relationships [Member] | Weeden Prime Services LLC [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets - initial value | 987,000 |
Trade Names [Member] | Weeden Prime Services LLC [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets - initial value | $ 70,000 |
[1] | Statement of financial condition as of December 31, 2019 represents the pro forma combination of Siebert and StockCross balances. See "Note 3 - Acquisitions" for additional detail.

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