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Fair Value Measurements (Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |  |
Securities owned, at fair value |  | $ 4,016,000 | $ 2,623,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 27,000 | 21,000
Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 896,000 | 479,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 27,000 | 21,000
Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 3,638,000 | 2,374,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 1 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 648,000 | 345,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 2 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 378,000 | 249,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 27,000 | 21,000
Level 2 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 248,000 | 134,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 27,000 | 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 | [1] | 2,990,000 | 2,029,000
U.S. government securities [Member] | Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | [1] | 2,990,000 | 2,029,000
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 |  | 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 |  |  |
Corporate bonds [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 38,000 | 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 |  | 38,000 | 24,000
Corporate bonds [Member] | Level 3 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
[1] | As of September 30, 2021 and December 31, 2020, the U.S. government securities had maturity dates of August 15, 2024 and August 31, 2021, respectively.

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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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