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Fair Value Measurements (Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value) (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |  |
Securities owned, at fair value |  | $ 3,350,000 | $ 3,991,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 9,000 | 24,000
Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 392,000 | 922,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 9,000 | 24,000
Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 3,085,000 | 3,455,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 1 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 240,000 | 489,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 2 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 265,000 | 536,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 9,000 | 24,000
Level 2 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 152,000 | 433,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 9,000 | 24,000
Level 3 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 3 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
U.S. government securities [Member] |  |  |
Assets |  |  |
Cash and securities segregated for regulatory purposes | [1] | 116,818,000 |
Securities owned, at fair value | [2] | 2,845,000 | 2,966,000
U.S. government securities [Member] | Level 1 [Member] |  |  |
Assets |  |  |
Cash and securities segregated for regulatory purposes | [1] | 116,818,000 |
Securities owned, at fair value | [2] | 2,845,000 | 2,966,000
U.S. government securities [Member] | Level 2 [Member] |  |  |
Assets |  |  |
Cash and securities segregated for regulatory purposes | [1] |  |
Securities owned, at fair value | [2] |  |
U.S. government securities [Member] | Level 3 [Member] |  |  |
Assets |  |  |
Cash and securities segregated for regulatory purposes | [1] |  |
Securities owned, at fair value | [2] |  |
Certificates of Deposit [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 92,000 | 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 |  | 92,000 | 91,000
Certificates of Deposit [Member] | Level 3 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
Municipal securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 10,000 |
Municipal securities [Member] | Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
Municipal securities [Member] | Level 2 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 10,000 |
Municipal securities [Member] | Level 3 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
Corporate bonds [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 11,000 | 12,000
Corporate bonds [Member] | Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
Corporate bonds [Member] | Level 2 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 11,000 | 12,000
Corporate bonds [Member] | Level 3 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | $ 0 |
[1] | As of June 30, 2022, the Company had U.S. government securities with market values of approximately $9.8 million, $9.9 million, $62.9 million, $24.3 million and 9.9 million and corresponding maturity dates of May 18, 2023, August 31, 2023, December 31, 2023, January 31, 2024 and May 31, 2024, respectively. As of December 31, 2021, the Company did not have any U.S. government securities classified as cash and securities segregated for regulatory purposes.
[2] | As of both June 30, 2022 and December 31, 2021, the U.S. government securities had a maturity date of August 15, 2024.

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