Organization	12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	1. Organization Siebert Financial Corp., a New York corporation incorporated in 1934, is a holding company that conducts its retail 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. (“SNXT”), a New York corporation registered with the U.S. Securities and Exchange Commission (“SEC”) as a RIA 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. Siebert conducts operations through its wholly-owned subsidiary, Siebert Technologies, LLC. (“STCH”), a Nevada limited liability company and developer of robo-advisory technology. In September 2019, the name of this subsidiary was changed from KCA Technologies, LLC. to Siebert Technologies, LLC. Siebert also offers prime brokerage services through its fifth wholly-owned subsidiary, Weeden Prime Services, LLC (“Weeden Prime”), a Delaware limited liability company and a broker-dealer registered with the SEC. For purposes of this Annual Report on Form 10-K, the terms “Siebert,” “Company,” “we,” “us,” and “our” refer to Siebert Financial Corp., MSCO, SNXT, PWC, STCH, and Weeden Prime 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 18 offices throughout the 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 can 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. All of the Company's revenues for the years ended December 31, 2019 and 2018 were derived from its operations in the U.S. As a result of its recent acquisitions, the Company re-evaluated its reportable segments and concluded that as of December 31, 2019, the Company is comprised of a single operating segment based on the factors related to management’s decision-making framework as well as management evaluating performance and allocating resources based on assessments of the Company from a consolidated perspective. Acquisitions in 2019 Weeden Prime Services, LLC As previously disclosed in a Current Report on Form 8-K filed on December 4, 2019, the Company completed the acquisition of 100% of the member interests in Weeden Prime. Effective December 1, 2019, Weeden Prime became a wholly-owned subsidiary of the Company and the operating results for the 31-day period ending December 31, 2019 were included in the Company’s statement of income. StockCross Financial Services, Inc. As previously disclosed in a Current Report on Form 8-K filed on January 25, 2019, the Company purchased approximately 15% of the outstanding shares of StockCross Financial Services, Inc. (“StockCross”), a clearing broker dealer. Subsequently, as previously disclosed in a Current Report on Form 8-K filed on January 7, 2020, the Company acquired the remaining 85% of StockCross’ outstanding shares in exchange for 3,298,774 shares of Common Stock. Effective January 1, 2020, StockCross was merged with and into MSCO and as of January 1, 2020, all clearing services provided by StockCross are now performed by MSCO. See “Note 20 – Subsequent Events” for additional detail on the transaction with StockCross. Acquisitions in 2018 Siebert Technologies, LLC. On August 21, 2018, the Company acquired all of the issued and outstanding membership interests of STCH from Kennedy Cabot Acquisition LLC, (“KCA”), one of the Company’s affiliates through common ownership, for approximately $690,000. This transaction was accounted for as an asset acquisition. STCH is a technology company initially tasked with developing a Robo-Advisor platform for SNXT. The Robo-Advisor provides clients with an automated wealth management solution intended to maximize portfolio returns based on the client’s specific risk tolerance. Park Wilshire Companies, Inc. In March 2018, the Company acquired all of the issued and outstanding shares of PWC, an insurance agency, from three related parties for approximately $110,000.

1. Organization

Siebert Financial Corp., a New York corporation incorporated in 1934, is a holding company that conducts its retail 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. (“SNXT”), a New York corporation registered with the U.S. Securities and Exchange Commission (“SEC”) as a RIA 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. Siebert conducts operations through its wholly-owned subsidiary, Siebert Technologies, LLC. (“STCH”), a Nevada limited liability company and developer of robo-advisory technology. In September 2019, the name of this subsidiary was changed from KCA Technologies, LLC. to Siebert Technologies, LLC. Siebert also offers prime brokerage services through its fifth wholly-owned subsidiary, Weeden Prime Services, LLC (“Weeden Prime”), a Delaware limited liability company and a broker-dealer registered with the SEC. For purposes of this Annual Report on Form 10-K, the terms “Siebert,” “Company,” “we,” “us,” and “our” refer to Siebert Financial Corp., MSCO, SNXT, PWC, STCH, and Weeden Prime 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 18 offices throughout the 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 can 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. All of the Company's revenues for the years ended December 31, 2019 and 2018 were derived from its operations in the U.S.

As a result of its recent acquisitions, the Company re-evaluated its reportable segments and concluded that as of December 31, 2019, the Company is comprised of a single operating segment based on the factors related to management’s decision-making framework as well as management evaluating performance and allocating resources based on assessments of the Company from a consolidated perspective.

Acquisitions in 2019

Weeden Prime Services, LLC

As previously disclosed in a Current Report on Form 8-K filed on December 4, 2019, the Company completed the acquisition of 100% of the member interests in Weeden Prime. Effective December 1, 2019, Weeden Prime became a wholly-owned subsidiary of the Company and the operating results for the 31-day period ending December 31, 2019 were included in the Company’s statement of income.

StockCross Financial Services, Inc.

As previously disclosed in a Current Report on Form 8-K filed on January 25, 2019, the Company purchased approximately 15% of the outstanding shares of StockCross Financial Services, Inc. (“StockCross”), a clearing broker dealer. Subsequently, as previously disclosed in a Current Report on Form 8-K filed on January 7, 2020, the Company acquired the remaining 85% of StockCross’ outstanding shares in exchange for 3,298,774 shares of Common Stock. Effective January 1, 2020, StockCross was merged with and into MSCO and as of January 1, 2020, all clearing services provided by StockCross are now performed by MSCO. See “Note 20 – Subsequent Events” for additional detail on the transaction with StockCross.

Acquisitions in 2018

Siebert Technologies, LLC.

On August 21, 2018, the Company acquired all of the issued and outstanding membership interests of STCH from Kennedy Cabot Acquisition LLC, (“KCA”), one of the Company’s affiliates through common ownership, for approximately $690,000. This transaction was accounted for as an asset acquisition. STCH is a technology company initially tasked with developing a Robo-Advisor platform for SNXT. The Robo-Advisor provides clients with an automated wealth management solution intended to maximize portfolio returns based on the client’s specific risk tolerance.

Park Wilshire Companies, Inc.

In March 2018, the Company acquired all of the issued and outstanding shares of PWC, an insurance agency, from three related parties for approximately $110,000.