Accounting Policies, by Policy (Policies)	3 Months Ended
Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements (“financial statements”) of the Company have been prepared on the accrual basis of accounting in conformity 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. The U.S. dollar is the functional currency of the Company and numbers are rounded for presentation purposes. 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 2022 Form 10-K.
Principles of Consolidation	Principles of Consolidation The financial statements include the accounts of Siebert and its wholly-owned and majority-owned consolidated subsidiaries. Upon consolidation, all intercompany balances and transactions are eliminated. For the period of March 31, 2022 to October 18, 2022, the Company determined that RISE was a variable interest entity (“VIE”) for which the Company was the primary beneficiary. As discussed in more detail in Note 4 – RISE, as of October 18, 2022, the Company’s ownership in RISE increased to 68% and therefore, the Company continued to consolidate RISE under the voting interest model (“VOE model”). The Company’s ownership in RISE remained 68% as of March 31, 2023. Certain reclassifications have been made to previously reported amounts to conform to current presentation. For consolidated subsidiaries that are not wholly-owned, the third-party holdings of equity interests are referred to as noncontrolling interests. The net income or loss attributable to noncontrolling interests for such subsidiaries is presented as net income or loss attributable to noncontrolling interests in the statements of operations. The portion of total equity that is attributable to noncontrolling interests for such subsidiaries is presented as noncontrolling interests in the statements of financial condition. For investments in entities in which the Company does not have a controlling financial interest but has significant influence over its operating and financial decisions, the Company applies the equity method of accounting with net income and losses recorded in earnings of equity method investment in related party.

Accounting Policies, by Policy (Policies)

3 Months Ended

Mar. 31, 2023

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements (“financial statements”) of the Company have been prepared on the accrual basis of accounting in conformity 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. The U.S. dollar is the functional currency of the Company and numbers are rounded for presentation purposes.

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 2022 Form 10-K.

Principles of Consolidation

Principles of Consolidation

The financial statements include the accounts of Siebert and its wholly-owned and majority-owned consolidated subsidiaries. Upon consolidation, all intercompany balances and transactions are eliminated. For the period of March 31, 2022 to October 18, 2022, the Company determined that RISE was a variable interest entity (“VIE”) for which the Company was the primary beneficiary. As discussed in more detail in Note 4 – RISE, as of October 18, 2022, the Company’s ownership in RISE increased to 68% and therefore, the Company continued to consolidate RISE under the voting interest model (“VOE model”). The Company’s ownership in RISE remained 68% as of March 31, 2023. Certain reclassifications have been made to previously reported amounts to conform to current presentation.

For consolidated subsidiaries that are not wholly-owned, the third-party holdings of equity interests are referred to as noncontrolling interests. The net income or loss attributable to noncontrolling interests for such subsidiaries is presented as net income or loss attributable to noncontrolling interests in the statements of operations. The portion of total equity that is attributable to noncontrolling interests for such subsidiaries is presented as noncontrolling interests in the statements of financial condition.

For investments in entities in which the Company does not have a controlling financial interest but has significant influence over its operating and financial decisions, the Company applies the equity method of accounting with net income and losses recorded in earnings of equity method investment in related party.