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8. Investment In and Advances to Affiliates (Details) (SiebertBrandfordShankAndCoLlcMember, USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
SiebertBrandfordShankAndCoLlcMember
        
Total assets $ 29,435,000   $ 29,435,000  
Total liabilities 11,006,000   11,006,000  
Total members’ capital 18,429,000   18,429,000  
Regulatory minimum net capital requirement 345,000   345,000  
Total revenues 6,731,000 8,911,000 20,785,000 17,659,000
Net income (loss) $ 380,000 $ 1,985,000 $ 1,812,000 $ (800,000)