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Goodwill and Intangible Assets, Net (Narrative) (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | [1] | Dec. 01, 2019
--- | --- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 1,989,000 | $ 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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