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Capital Requirements (Details) - USD ($)
Oct. 02, 2020
Sep. 30, 2020
Jan. 02, 2020
Dec. 31, 2019
MSCO [Member]        
Net capital   $ 27,900,000   $ 4,400,000
Minimum net capital required   2,300,000   250,000
Net capital in excess of minimum requirement   $ 25,600,000   4,200,000
Percentage of aggregate debit balance to net capital   24.40%    
Cash deposits   $ 264,000,000    
Minimum cash deposits required   247,400,000    
Cash deposits in excess of minimum requirement   16,600,000    
MSCO [Member] | Subsequent Event [Member]        
Cash deposits in excess of minimum requirement $ 7,100,000      
StockCross [Member]        
Net capital       18,800,000
Minimum net capital required       2,100,000
Net capital in excess of minimum requirement       $ 16,700,000
Percentage of aggregate debit balance to net capital       17.60%
Cash deposits       $ 222,100,000
Minimum cash deposits required       219,400,000
Cash deposits in excess of minimum requirement     $ 1,000,000 4,000,000
Fair value of Securities on Deposit       1,300,000
Segregated cash       1,400,000
StockCross [Member] | Special Reserve Account [Member]        
Deposits       223,400,000
Cash deposits in excess of minimum requirement     $ 218,000  
Segregated cash       1,400,000
Minimum cash deposit requirement       1,700,000
Cash deposits in deficit of minimum requirement       282,000
Weeden Prime Services LLC [Member]        
Net capital   3,700,000   3,900,000
Minimum net capital required   250,000   250,000
Net capital in excess of minimum requirement   $ 3,500,000   $ 3,700,000