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Fair Value Measurements (Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value) (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities sold, not yet purchased, at fair value | $ 88,000 |
Level 1 [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities sold, not yet purchased, at fair value | 88,000 |
Level 2 [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities sold, not yet purchased, at fair value |  |
Level 3 [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities sold, not yet purchased, at fair value |  |
Equity Securities [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities sold, not yet purchased, at fair value | 88,000 |
Equity Securities [Member] | Level 1 [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities sold, not yet purchased, at fair value | 88,000 |
Equity Securities [Member] | Level 2 [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities sold, not yet purchased, at fair value |  |
Equity Securities [Member] | Level 3 [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities sold, not yet purchased, at fair value |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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