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Fair Value Measurements (Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value) (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Securities owned, at fair value | $ 3,400,000 | $ 3,991,000
Other equity investment in related party, at fair value | 1,036,000 |
Liabilities |  |
Securities sold, not yet purchased, at fair value | 52,000 | 24,000
Equity Securities [Member] |  |
Assets |  |
Securities owned, at fair value | 255,000 | 922,000
Liabilities |  |
Securities sold, not yet purchased, at fair value | 27,000 | 24,000
UITs [Member] |  |
Liabilities |  |
Securities sold, not yet purchased, at fair value | 25,000 |
Level 1 [Member] |  |
Assets |  |
Securities owned, at fair value | 2,977,000 | 3,455,000
Other equity investment in related party, at fair value |  |
Liabilities |  |
Securities sold, not yet purchased, at fair value |  |
Level 1 [Member] | Equity Securities [Member] |  |
Assets |  |
Securities owned, at fair value | 116,000 | 489,000
Liabilities |  |
Securities sold, not yet purchased, at fair value |  |
Level 1 [Member] | UITs [Member] |  |
Liabilities |  |
Securities sold, not yet purchased, at fair value |  |
Level 2 [Member] |  |
Assets |  |
Securities owned, at fair value | 423,000 | 536,000
Other equity investment in related party, at fair value |  |
Liabilities |  |
Securities sold, not yet purchased, at fair value | 52,000 | 24,000
Level 2 [Member] | Equity Securities [Member] |  |
Assets |  |
Securities owned, at fair value | 139,000 | 433,000
Liabilities |  |
Securities sold, not yet purchased, at fair value | 27,000 | 24,000
Level 2 [Member] | UITs [Member] |  |
Liabilities |  |
Securities sold, not yet purchased, at fair value | 25,000 |
Level 3 [Member] |  |
Assets |  |
Securities owned, at fair value |  |
Other equity investment in related party, at fair value | 1,036,000 |
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 |  |
Level 3 [Member] | UITs [Member] |  |
Liabilities |  |
Securities sold, not yet purchased, at fair value |  |
U.S. government securities [Member] |  |
Assets |  |
Cash and securities segregated for regulatory purposes | 97,655,000 |
Securities owned, at fair value | 3,032,000 | 2,966,000
U.S. government securities [Member] | Level 1 [Member] |  |
Assets |  |
Cash and securities segregated for regulatory purposes | 97,655,000 |
Securities owned, at fair value | 2,860,000 | 2,966,000
U.S. government securities [Member] | Level 2 [Member] |  |
Assets |  |
Cash and securities segregated for regulatory purposes |  |
Securities owned, at fair value | 172,000 |
U.S. government securities [Member] | Level 3 [Member] |  |
Assets |  |
Cash and securities segregated for regulatory purposes |  |
Securities owned, at fair value |  |
Certificates of Deposit [Member] |  |
Assets |  |
Securities owned, at fair value | 91,000 | 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 | 91,000 | 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 |  |
Options [Member] |  |
Assets |  |
Securities owned, at fair value | 1,000 |
Options [Member] | Level 1 [Member] |  |
Assets |  |
Securities owned, at fair value | 1,000 |
Options [Member] | Level 2 [Member] |  |
Assets |  |
Securities owned, at fair value |  |
Options [Member] | Level 3 [Member] |  |
Assets |  |
Securities owned, at fair value |  |

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