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Fair Value Measurements (Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |  |
Cash and securities segregated for regulatory purposes | $ 326,826,000 | $ 324,924,000 |
Securities owned, at fair value | 3,991,000 | 2,623,000 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value | 24,000 | 21,000 |
Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | 922,000 | 479,000 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value | 24,000 | 21,000 |
Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | 3,455,000 | 2,374,000 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 1 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | 489,000 | 345,000 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 2 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | 536,000 | 249,000 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value | 24,000 | 21,000 |
Level 2 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | 433,000 | 134,000 |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value | 24,000 | 21,000 |
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 |  |  |
Securities owned, at fair value | 2,966,000 | 2,029,000 | [1]
U.S. government securities [Member] | Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | 2,966,000 | 2,029,000 | [1]
U.S. government securities [Member] | Level 2 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  | [1]
U.S. government securities [Member] | Level 3 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  | [1]
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 |  |  |
Corporate bonds [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | 12,000 | 24,000 |
Corporate bonds [Member] | Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
Corporate bonds [Member] | Level 2 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | 12,000 | 24,000 |
Corporate bonds [Member] | Level 3 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
[1] | As of December 31, 2021 and 2020, the U.S. government securities had maturity dates of August 15, 2024 and August 31, 2021, respectively.

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- Definition Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers). + References No definition available. + Details
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- Definition Fair value of financial instruments sold short by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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