Annual report pursuant to section 13 and 15(d)

Securities Owned and Securities Sold, But Not Yet Purchased (Narrative) (Details)

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Securities Owned and Securities Sold, But Not Yet Purchased (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Securities owned deposited with the Company's subsidiaries clearing broker $ 4,014 $ 1,787
Securities owned, at fair value 4,789 2,078
Common Stock and Warrants [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Securities owned, at fair value 689 384
Level 2 [Member] | Common Stock and Warrants [Member] | Warrants to purchase common stock
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Securities owned, at fair value $ 534 $ 160