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11. Results of former affiliate (Details) - Siebert Cisneros Shank, LLC [Member] - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Total revenues $ 10,322,000 $ 24,291,000
Net income $ 1,114,000 $ 1,607,000