Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 25, 2020
Document And Entity Information
Entity Registrant Name	SIEBERT FINANCIAL CORP
Entity Central Index Key	0000065596
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		30,653,710
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2020
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity File Number	0-5703
Entity Incorporation State or Country Code	NY