Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2023	Aug. 04, 2023
Document Information Line Items
Entity Registrant Name	Siebert Financial Corp.
Trading Symbol	SIEB
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		39,580,936
Amendment Flag	false
Entity Central Index Key	0000065596
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Jun. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	0-5703
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	11-1796714
Entity Address, Address Line One	535 Fifth Avenue
Entity Address, Address Line Two	4th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	(212)
Local Phone Number	644-2400
Title of 12(b) Security	Common Stock - $0.01 par value
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes