Organization and Basis of Presentation (Policies)	3 Months Ended
Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements (“financial statements”) of the Company have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim financial information with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP for complete annual financial statements. In the opinion of management, the financial statements contain all adjustments (consisting of normal recurring entries) necessary to fairly present such interim results. Interim results are not necessarily indicative of the results of operations which may be expected for a full year or any subsequent period. These financial statements should be read in conjunction with the financial statements and notes thereto in the Company’s 2021 Form 10-K.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of Siebert and its consolidated subsidiaries, each of which is a wholly-owned subsidiary, as well as the 44% investment in a VIE for which the Company has determined it is the primary beneficiary. Upon consolidation, all intercompany balances and transactions are eliminated. The U.S. dollar is the functional currency of the Company and numbers are rounded for presentation purposes. The Company’s investments in non-majority-owned partnerships and affiliates are accounted for using the equity method or at fair value, until such time that they become wholly or majority-owned. Earnings attributable to noncontrolling interests are recorded on the statements of operations relating to wholly or majority-owned subsidiaries with the appropriate noncontrolling interest that represents the portion of equity not related to the Company’s ownership interest recorded on the statements of financial condition in each period. Significant Accounting Policies The Company’s significant accounting policies are included in Note 2 – Summary of Significant Accounting Policies in the Company’s 2021 Form 10-K. Other than the below, there have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2022. Variable Interest Entities The Company evaluates whether an entity is a VIE and determines if the primary beneficiary status is appropriate on a quarterly basis. The Company consolidates a VIE for which it is the primary beneficiary. When assessing the determination of the primary beneficiary, the Company considers all relevant facts and circumstances, including factors such as the power to direct the activities of the VIE that most significantly impact its economic performance, the obligation to absorb the losses and/or the right to receive the expected returns of the VIE. Through this evaluation, the Company determined that RISE is a VIE and the Company is the primary beneficiary, primarily due to the Company having the power to direct the activities of RISE that most significantly impact its economic performance. Additionally, the Company may be obligated to fund RISE’s operations at an amount that is disproportional to its ownership percentage.

Organization and Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying condensed consolidated financial statements (“financial statements”) of the Company have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) for interim financial information with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by GAAP for complete annual financial statements.

In the opinion of management, the financial statements contain all adjustments (consisting of normal recurring entries) necessary to fairly present such interim results. Interim results are not necessarily indicative of the results of operations which may be expected for a full year or any subsequent period. These financial statements should be read in conjunction with the financial statements and notes thereto in the Company’s 2021 Form 10-K.

Principles of Consolidation

The consolidated financial statements include the accounts of Siebert and its consolidated subsidiaries, each of which is a wholly-owned subsidiary, as well as the 44% investment in a VIE for which the Company has determined it is the primary beneficiary. Upon consolidation, all intercompany balances and transactions are eliminated. The U.S. dollar is the functional currency of the Company and numbers are rounded for presentation purposes.

The Company’s investments in non-majority-owned partnerships and affiliates are accounted for using the equity method or at fair value, until such time that they become wholly or majority-owned. Earnings attributable to noncontrolling interests are recorded on the statements of operations relating to wholly or majority-owned subsidiaries with the appropriate noncontrolling interest that represents the portion of equity not related to the Company’s ownership interest recorded on the statements of financial condition in each period.

Significant Accounting Policies

The Company’s significant accounting policies are included in Note 2 – Summary of Significant Accounting Policies in the Company’s 2021 Form 10-K. Other than the below, there have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2022.

Variable Interest Entities

The Company evaluates whether an entity is a VIE and determines if the primary beneficiary status is appropriate on a quarterly basis. The Company consolidates a VIE for which it is the primary beneficiary. When assessing the determination of the primary beneficiary, the Company considers all relevant facts and circumstances, including factors such as the power to direct the activities of the VIE that most significantly impact its economic performance, the obligation to absorb the losses and/or the right to receive the expected returns of the VIE. Through this evaluation, the Company determined that RISE is a VIE and the Company is the primary beneficiary, primarily due to the Company having the power to direct the activities of RISE that most significantly impact its economic performance. Additionally, the Company may be obligated to fund RISE’s operations at an amount that is disproportional to its ownership percentage.