8. Investment In and Advances to Affiliates (Details 1) (SiebertBrandfordShankAndCoLlcMember, USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
SiebertBrandfordShankAndCoLlcMember
Total assets	$ 150,890,000
Total liabilities	150,099,000
Total members capital	791,000
Total revenues	(222,000)	21,000
Net income (loss)	$ (275,000)	$ (25,000)