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Receivables From, Payables To, and Deposits With Broker-Dealers and Clearing Organizations (Narrative) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Common stock valued DTCC | [1] | $ 309,000 | $ 304,000 | [2]
MSCO shares [Member] |  |  |  |
Common stock valued DTCC |  | $ 937,000 |  |
StockCross shares [Member] |  |  |  |
Common stock valued DTCC |  |  | $ 359,000 |
[1] | Shares outstanding as of December 31, 2019 represents the combined total of the Company's shares outstanding and the shares issued for the Company's acquisition of StockCross. See "Note 1 - Organization and Basis of Presentation" for additional detail. Shares authorized were 100 million and 49 million as of December 31, 2020 and 2019, respectively.
[2] | Statement of financial condition as of December 31, 2019 represents the pro forma combination of Siebert and StockCross balances. See "Note 3 - Acquisitions" for additional detail.

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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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