SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Securities and other investments owned
Securities owned	$ 78,204	$ 16,579
Securities sold not yet purchased:
Securities sold not yet purchased	3,526	846
Common Stocks and Warrants [Member]
Securities and other investments owned
Securities owned	20,771	2,084
Corporate Bonds [Member]
Securities and other investments owned
Securities owned	1,620	1,025
Securities sold not yet purchased:
Securities sold not yet purchased	932	846
Partnership Interests [Member]
Securities and other investments owned
Securities owned	26,705	$ 13,470
Common Stock [Member]
Securities sold not yet purchased:
Securities sold not yet purchased	2,594
Loans Receivable [Member]
Securities and other investments owned
Securities owned	$ 29,108