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Fair Value Measurements (Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |  |  |
Cash and securities segregated for regulatory purposes |  | $ 324,924,000 | $ 224,924,000 | [1]
Securities owned, at fair value |  | 2,623,000 | 3,018,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  | 21,000 | 116,000 | [1]
Equity Securities [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 479,000 | 986,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  | 21,000 | 116,000 |
Level 1 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 2,374,000 | 2,460,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  |  | 88,000 |
Level 1 [Member] | Equity Securities [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 345,000 | 453,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  |  | 88,000 |
Level 2 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 249,000 | 270,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  | 21,000 | 28,000 |
Level 2 [Member] | Equity Securities [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 134,000 | 245,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  | 21,000 | 288,000 |
Level 3 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  | 280,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |
Level 3 [Member] | Equity Securities [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  | 288,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |
U.S. government securities [Member] |  |  |  |
Assets |  |  |  |
Cash and securities segregated for regulatory purposes | [2] |  | 1,311,000 |
Securities owned, at fair value | [3] | 2,029,000 | 2,007,000 |
U.S. government securities [Member] | Level 1 [Member] |  |  |  |
Assets |  |  |  |
Cash and securities segregated for regulatory purposes | [2] |  | 1,311,000 |
Securities owned, at fair value | [3] | 2,029,000 | 2,007,000 |
U.S. government securities [Member] | Level 2 [Member] |  |  |  |
Assets |  |  |  |
Cash and securities segregated for regulatory purposes | [2] |  |  |
Securities owned, at fair value | [3] |  |  |
U.S. government securities [Member] | Level 3 [Member] |  |  |  |
Assets |  |  |  |
Cash and securities segregated for regulatory purposes | [2] |  |  |
Securities owned, at fair value | [3] |  |  |
Certificates of Deposit [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 91,000 |  |
Certificates of Deposit [Member] | Level 1 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  |  |
Certificates of Deposit [Member] | Level 2 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 91,000 |  |
Certificates of Deposit [Member] | Level 3 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  |  |
Corporate bonds [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 24,000 | 25,000 |
Corporate bonds [Member] | Level 1 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  |  |
Corporate bonds [Member] | Level 2 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  | 24,000 | 25,000 |
Corporate bonds [Member] | Level 3 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  |  |
[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.
[2] | As of December 31, 2019, these U.S. government securities mature on 02/29/20
[3] | As of December 31, 2020 and 2019, these U.S. government securities mature on 08/31/21

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