Organization and Basis of Presentation	3 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	1. Organization and Basis of Presentation Organization Siebert Financial Corp., a New York corporation incorporated in 1934, is a holding company that conducts its retail discount brokerage business through its wholly-owned subsidiary, Muriel Siebert & Co., Inc. (“MSCO”), a Delaware corporation and registered broker-dealer, its investment advisory business through its wholly-owned subsidiary, Siebert AdvisorNXT, Inc. (“AdvisorNXT”), a New York corporation registered with the SEC as a Registered Investment Advisor under the Investment Advisers Act of 1940, as amended, and its insurance business through its wholly-owned subsidiary, Park Wilshire Companies, Inc. (“PWC”), a Texas corporation and licensed insurance agency. It also conducts operations through a fourth subsidiary, KCA Technologies, LLC. (“KCAT”), a Nevada limited liability company and developer of robo-advisory technology. For purposes of this Quarterly Report on Form 10-Q, the terms “Siebert,” “Company,” “we,” “us,” and “our” refer to Siebert Financial Corp., MSCO, AdvisorNXT, PWC, and KCAT collectively, unless the context otherwise requires. The Company is headquartered in New York, NY, with primary operations in New Jersey and California. The Company has offices throughout the United States of America (“U.S.”) and clients around the world. The Company’s SEC filings are available through the Company’s website at www.siebertnet.com, where investors are able to obtain copies of the Company’s public filings free of charge. The Company’s common stock (“Common Stock”), par value $.01 per share, trades on the Nasdaq Capital Market under the symbol “SIEB.” The Company primarily operates in the securities brokerage and asset management industry and has no other reportable segments. All of the Company's revenues for the three months ended March 31, 2019 and 2018 were derived from its operations in the U.S. Basis of Presentation Basis of Presentation The unaudited condensed consolidated 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 the Company’s management, the accompanying unaudited 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 unaudited condensed consolidated financial statements should be read in conjunction with the financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“2018 Form 10-K”). The consolidated financial statements include the accounts of Siebert and its wholly-owned subsidiaries and upon consolidation, all intercompany balances and transactions are eliminated. The U.S. dollar is the functional currency of the Company. Reclassifications Certain prior period amounts have been reclassified to conform to the current year’s presentation. These reclassifications have no effect on previously reported net income or total assets or total liabilities. Significant Accounting Policies The Company’s significant accounting policies are included in Note 2 in the Company’s 2018 Form 10-K. There have been no significant changes to these accounting policies for the three months ended March 31, 2019 except as described in the sections “Equity Method Investment” and the “Note 2 – New Accounting Standards” below. Equity Method Investments Investments in which the Company has the ability to exercise significant influence, but does not control, are accounted for under the equity method of accounting and are included in the investment in related party asset on the condensed consolidated statements of financial condition. Under this method of accounting, the Company’s share of the net earnings or losses of the investee is presented below the income tax line on the condensed consolidated statements of operations. The Company evaluates its equity method investments whenever events or changes in circumstance indicate that the carrying amounts of such investments may be impaired. If a decline in the value of an equity method investment is determined to be other than temporary, a loss is recorded in earnings in the current period.

1. Organization and Basis of Presentation

Organization

Siebert Financial Corp., a New York corporation incorporated in 1934, is a holding company that conducts its retail discount brokerage business through its wholly-owned subsidiary, Muriel Siebert & Co., Inc. (“MSCO”), a Delaware corporation and registered broker-dealer, its investment advisory business through its wholly-owned subsidiary, Siebert AdvisorNXT, Inc. (“AdvisorNXT”), a New York corporation registered with the SEC as a Registered Investment Advisor under the Investment Advisers Act of 1940, as amended, and its insurance business through its wholly-owned subsidiary, Park Wilshire Companies, Inc. (“PWC”), a Texas corporation and licensed insurance agency. It also conducts operations through a fourth subsidiary, KCA Technologies, LLC. (“KCAT”), a Nevada limited liability company and developer of robo-advisory technology. For purposes of this Quarterly Report on Form 10-Q, the terms “Siebert,” “Company,” “we,” “us,” and “our” refer to Siebert Financial Corp., MSCO, AdvisorNXT, PWC, and KCAT collectively, unless the context otherwise requires.

The Company is headquartered in New York, NY, with primary operations in New Jersey and California. The Company has offices throughout the United States of America (“U.S.”) and clients around the world. The Company’s SEC filings are available through the Company’s website at www.siebertnet.com, where investors are able to obtain copies of the Company’s public filings free of charge. The Company’s common stock (“Common Stock”), par value $.01 per share, trades on the Nasdaq Capital Market under the symbol “SIEB.”

The Company primarily operates in the securities brokerage and asset management industry and has no other reportable segments. All of the Company's revenues for the three months ended March 31, 2019 and 2018 were derived from its operations in the U.S.

Basis of Presentation

The unaudited condensed consolidated 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 the Company’s management, the accompanying unaudited 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 unaudited condensed consolidated financial statements should be read in conjunction with the financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“2018 Form 10-K”). The consolidated financial statements include the accounts of Siebert and its wholly-owned subsidiaries and upon consolidation, all intercompany balances and transactions are eliminated. The U.S. dollar is the functional currency of the Company.

Reclassifications

Certain prior period amounts have been reclassified to conform to the current year’s presentation. These reclassifications have no effect on previously reported net income or total assets or total liabilities.

Significant Accounting Policies

The Company’s significant accounting policies are included in Note 2 in the Company’s 2018 Form 10-K. There have been no significant changes to these accounting policies for the three months ended March 31, 2019 except as described in the sections “Equity Method Investment” and the “Note 2 – New Accounting Standards” below.

Equity Method Investments

Investments in which the Company has the ability to exercise significant influence, but does not control, are accounted for under the equity method of accounting and are included in the investment in related party asset on the condensed consolidated statements of financial condition. Under this method of accounting, the Company’s share of the net earnings or losses of the investee is presented below the income tax line on the condensed consolidated statements of operations. The Company evaluates its equity method investments whenever events or changes in circumstance indicate that the carrying amounts of such investments may be impaired. If a decline in the value of an equity method investment is determined to be other than temporary, a loss is recorded in earnings in the current period.