v3.26.1
Cover - shares
6 Months Ended
Jun. 30, 2026
Aug. 11, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Amendment Flag false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity File Number 0-5703  
Entity Registrant Name Siebert Financial Corp.  
Entity Central Index Key 0000065596  
Entity Incorporation, State or Country Code NY  
Entity Tax Identification Number 11-1796714  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
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  
City Area Code (310)  
Local Phone Number 385-1861  
Title of 12(b) Security Common Stock - $0.01 par value  
Trading Symbol SIEB  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   41,100,936