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Securities Owned/Sold but Not Yet Purchased (Tables)
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Securities Owned/Sold But Not Yet Purchased
These securities consist of the following:
                 
 
June 30,
2019
   
December 31,
2018
 
Securities Owned
   
     
 
Trading securities
  $
9,095
    $
8,873
 
                 
Securities Sold, but not yet Purchased
   
     
 
Trading securities
  $
543
    $
1,698