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10. Investment In Affiliates (Details) - Siebert Brandford Shank Co LLC [Member] - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Total assets $ 24,497,000   $ 24,497,000  
Total liabilities 7,030,000   7,030,000  
Total members' capital 17,467,000   17,467,000  
Regulatory minimum net capital requirement for SBS 250,000   250,000  
Total revenues 10,322,000 $ 4,277,000 24,291,000 $ 16,661,000
Net income (loss) $ 1,114,000 $ (802,000) $ 1,607,000 $ 8,000