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Fair Value Measurements (Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value) (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |  |  |
Securities owned, at fair value | $ 3,480,000 |  | $ 3,018,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value | 25,000 |  | 116,000 | [1]
Equity Securities [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value | 1,108,000 |  | 986,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value | 25,000 |  | 116,000 |
Level 1 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value | 2,926,000 |  | 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 | 765,000 |  | 453,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value |  |  | 88,000 |
Level 2 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value | 554,000 |  | 270,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value | 25,000 |  | 28,000 |
Level 2 [Member] | Equity Securities [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value | 343,000 |  | 245,000 |
Liabilities |  |  |  |
Securities sold, not yet purchased, at fair value | 25,000 |  | 28,000 |
Level 3 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  | 288,000 |
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 |  |  |  |
Certificates of Deposit [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 142,000 |  | 142,000 |
Securities owned, at fair value | 91,000 |  |  |
Certificates of Deposit [Member] | Level 1 [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Securities owned, at fair value |  |  |  |
Certificates of Deposit [Member] | Level 2 [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 142,000 |  | 142,000 |
Securities owned, at fair value | 91,000 |  |  |
Certificates of Deposit [Member] | Level 3 [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Securities owned, at fair value |  |  |  |
U.S. government securities [Member] |  |  |  |
Assets |  |  |  |
Segregated securities |  |  | 1,311,000 |
Securities owned, at fair value | 2,028,000 | [2] | 2,007,000 |
U.S. government securities [Member] | Level 1 [Member] |  |  |  |
Assets |  |  |  |
Segregated securities |  |  | 1,311,000 |
Securities owned, at fair value | 2,028,000 | [2] | 2,007,000 |
U.S. government securities [Member] | Level 2 [Member] |  |  |  |
Assets |  |  |  |
Segregated securities |  |  |  |
Securities owned, at fair value |  | [2] |  |
U.S. government securities [Member] | Level 3 [Member] |  |  |  |
Assets |  |  |  |
Segregated securities |  |  |  |
Securities owned, at fair value |  | [2] |  |
Corporate bonds [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value | 120,000 |  | 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 | 120,000 |  | 25,000 |
Corporate bonds [Member] | Level 3 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  |  |
Mutual Fund [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value | 133,000 |  |  |
Mutual Fund [Member] | Level 1 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value | 133,000 |  |  |
Mutual Fund [Member] | Level 2 [Member] |  |  |  |
Assets |  |  |  |
Securities owned, at fair value |  |  |  |
Mutual Fund [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 September 30, 2020, U.S. government securities mature on 08/31/2021

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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