Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 12, 2017
Document And Entity Information
Entity Registrant Name	Siebert Financial Corp
Entity Central Index Key	0000065596
Document Type	10-Q/A
Document Period End Date	Mar. 31, 2017
Amendment Flag	true
Amendment Description	This Amendment No. 1 on Form 10-Q/A (the "Amendment") to the quarterly report on Form 10-Q for Siebert Financial Corp. for the period ended March 31, 2017 (the "Form 10-Q"), filed with the Securities and Exchange Commission on May 12, 2017 (the "Original Filing Date"), is being filed to provide information in the XBRL files regarding the Supplemental Schedule of Non-Cash Financing Activities that was inadvertently omitted from the original Form 10-Q.
Current Fiscal Year End Date	--12-31
Is Entity a Well-known Seasoned Issuer?	No
Is Entity a Voluntary Filer?	No
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		22,085,126
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2017