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10. Investment In Affiliates (Details) - Siebert Brandford Shank Co LLC [Member]
 3 Months Ended
Mar. 31, 2015
USD ($)
Total assets, including secured demand note of $1,200,000 due from Siebert $ 26,480,000
Total liabilities, including subordinated liabilities of $1,200,000 due to Siebert 11,972,000
Total members' capital 14,508,000
Regulatory minimum net capital requirement 250,000
Total revenues 4,049,000
Net income (loss) $ (1,521,000)