Cover - USD ($)	12 Months Ended
	Dec. 31, 2023	May 01, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Financial Statement Error Correction [Flag]	false
Entity Interactive Data Current	Yes
ICFR Auditor Attestation Flag	false
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Documents Incorporated by Reference [Text Block]	None
Entity Information [Line Items]
Entity Registrant Name	Siebert Financial Corp.
Entity Central Index Key	0000065596
Entity File Number	0-5703
Entity Tax Identification Number	11-1796714
Entity Incorporation, State or Country Code	NY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Public Float			$ 34,620,000
Entity Contact Personnel [Line Items]
Entity Address, Address Line One	653 Collins Avenue
Entity Address, Address Line Two	Miami Beach
Entity Address, City or Town	FL
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33139
Entity Phone Fax Numbers [Line Items]
City Area Code	(310)
Local Phone Number	385-1861
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock - $0.01 par value
Trading Symbol	SIEB
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		39,830,936