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Organization and Basis of Presentation (Details) - USD ($)
Jan. 02, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 04, 2019
Jan. 18, 2019
Business Acquisition [Line Items]          
Common stock, par value   $ 0.01 $ 0.01    
Deposits with and other non current receivables from broker-dealers and clearing organizations   $ 2,200,000 $ 1,800,000    
NFS [Member]          
Business Acquisition [Line Items]          
Cash clearing deposits   50,000 50,000    
StockCross [Member]          
Business Acquisition [Line Items]          
Cash clearing deposits     75,000    
Goldman Sachs [Member]          
Business Acquisition [Line Items]          
Cash clearing deposits   2,000,000 2,000,000    
Pershing [Member]          
Business Acquisition [Line Items]          
Cash clearing deposits   $ 1,000,000 $ 1,000,000    
Weeden Prime Services LLC [Member]          
Business Acquisition [Line Items]          
Percentage of acquired interest       100.00%  
StockCross Financial Services, Inc. [Member]          
Business Acquisition [Line Items]          
Percentage of remaining interest in StockCross purchased under binding letter of intent 85.00%       15.00%
Issue of common share in exchange under acquisition 3,298,774