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Investment in Securities, Securities Sold, Not Yet Purchased (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Investment in Equity Securities [Abstract]    
Cost $ 0 $ 728
Estimated Fair Value 0 799
Common Stocks [Member]    
Investment in Equity Securities [Abstract]    
Cost 0 728
Estimated Fair Value $ 0 $ 799