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Fair Value Measurements (Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value) (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |  |
Securities owned, at fair value |  | $ 4,275,000 | $ 2,623,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 49,000 | 21,000
Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 2,154,000 | 479,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 27,000 | 21,000
Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 3,113,000 | 2,374,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 1 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 1,098,000 | 345,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Level 2 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 1,162,000 | 249,000
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 49,000 | 21,000
Level 2 [Member] | Equity Securities [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  | 1,056,000 | 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] | 2,015,000 | 2,029,000
U.S. government securities [Member] | Level 1 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value | [1] | 2,015,000 | 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 |  | 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 |  | 15,000 | 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 |  | 15,000 | 24,000
Corporate bonds [Member] | Level 3 [Member] |  |  |
Assets |  |  |
Securities owned, at fair value |  |  |
Unit investment trust [Member] |  |  |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 22,000 |
Unit investment trust [Member] | Level 1 [Member] |  |  |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
Unit investment trust [Member] | Level 2 [Member] |  |  |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  | 22,000 |
Unit investment trust [Member] | Level 3 [Member] |  |  |
Liabilities |  |  |
Securities sold, not yet purchased, at fair value |  |  |
[1] | As of June 30, 2021 and December 31, 2020, these U.S. government securities mature on 08/31/21

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