Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Securities owned, at fair value:	$ 14,173	$ 7,436
Liabilities
Securities sold, not yet purchased, at fair value:	9,108	2,953
Recurring basis | Total
Assets
Total Assets	17,513	10,164
Liabilities
Total Liabilities	9,108	2,953
Recurring basis | Total | Tax free money market mutual funds
Assets
Cash and cash equivalents:	33	33
Recurring basis | Total | Money market mutual funds
Assets
Cash and cash equivalents:	3,307	2,695
Recurring basis | Total | Corporate stocks-trading securities
Assets
Securities owned, at fair value:	9,857	2,894
Liabilities
Securities sold, not yet purchased, at fair value:	9,108	2,953
Recurring basis | Total | Mutual funds
Assets
Securities owned, at fair value:	4,316	4,542
Recurring basis | Level 1
Assets
Total Assets	17,513	10,164
Liabilities
Total Liabilities	9,108	2,953
Recurring basis | Level 1 | Tax free money market mutual funds
Assets
Cash and cash equivalents:	33	33
Recurring basis | Level 1 | Money market mutual funds
Assets
Cash and cash equivalents:	3,307	2,695
Recurring basis | Level 1 | Corporate stocks-trading securities
Assets
Securities owned, at fair value:	9,857	2,894
Liabilities
Securities sold, not yet purchased, at fair value:	9,108	2,953
Recurring basis | Level 1 | Mutual funds
Assets
Securities owned, at fair value:	$ 4,316	$ 4,542