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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]    
Total Revenue from Margin interest, marketing and distribution fees $ 11,121,000 $ 10,928,000
Total Revenue from Principal transactions 8,061,000 9,020,000
Total Revenue from Commissions and fees 8,302,000 9,504,000
Total Revenue from Interest 308,000 106,000
Total revenue 28,593,000 30,036,000
Legacy Siebert [Member]    
Disaggregation of Revenue [Line Items]    
Total Revenue from Advisory fees 801,000 478,000
Total Revenue from Interest 308,000 106,000
Margin interest, marketing and distribution fees [Member] | Legacy Siebert [Member]    
Disaggregation of Revenue [Line Items]    
Total Revenue from Margin interest, marketing and distribution fees 9,723,000 9,674,000
Margin interest, marketing and distribution fees [Member] | StockCross accounts [Member]    
Disaggregation of Revenue [Line Items]    
Total Revenue from Margin interest, marketing and distribution fees 1,398,000 1,254,000
Principal transactions [Member] | Legacy Siebert [Member]    
Disaggregation of Revenue [Line Items]    
Total Revenue from Principal transactions 2,154,000 1,894,000
Principal transactions [Member] | StockCross accounts [Member]    
Disaggregation of Revenue [Line Items]    
Total Revenue from Principal transactions 5,907,000 7,126,000
Commissions and fees [Member] | Legacy Siebert [Member]    
Disaggregation of Revenue [Line Items]    
Total Revenue from Commissions and fees 7,037,000 7,792,000
Commissions and fees [Member] | StockCross accounts [Member]    
Disaggregation of Revenue [Line Items]    
Total Revenue from Commissions and fees $ 1,265,000 $ 1,712,000