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Acquisitions (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Dec. 01, 2019
Jan. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jan. 02, 2020
Dec. 31, 2019
Business Acquisition [Line Items]            
Purchase of StockCross common stock     $ 3,665,000    
Treasury stock sales - StockCross     $ 172,000    
Effective tax rate     35.00% 24.00%    
Goodwill     $ 1,989,000     $ 1,989,000 [1]
StockCross [Member]            
Business Acquisition [Line Items]            
Ownership percentage acquired   15.00%        
Purchase price   $ 29,750,000        
Purchase price in shares as restricted stock   3,298,774        
Effective tax rate       28.00%    
Goodwill          
When StockCross Merged with MSCO [Member]            
Business Acquisition [Line Items]            
Ownership percentage acquired         85.00%  
WP [Member]            
Business Acquisition [Line Items]            
Effective tax rate 28.00%          
Goodwill $ 1,989,000          
[1] Statement of financial condition as of December 31, 2019 represents the pro forma combination of Siebert and StockCross balances. See "Note 3 - Acquisitions" for additional detail.