10. Results of former affiliate (Details) - Siebert Brandford Shank Co LLC [Member]	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)
Total assets, including secured demand note of $1,200,000 due from Siebert	$ 32,104,000	$ 32,104,000
Total liabilities, including subordinated liabilities of $1,200,000 due to Siebert	15,724,000	15,724,000
Total members' capital	16,380,000	16,380,000
Regulatory minimum net capital requirement	250,000	250,000
Total revenues	9,919,000	13,969,000
Net income (loss)	$ 2,014,000	$ 495,000