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Revenue from Contracts with Customers (Tables)
6 Months Ended
Jun. 30, 2020
Revenue from Contracts with Customers [Abstract]  
Total Revenues by Type
Total revenues from contracts with customers by type were as follows for the three months and six months ended June 30, 2020 and 2019:

  
Three months ended June 30,
  
Six months ended June 30,
 
  
2020
  
2019
  
2020
  
2019
 
Commissions
 
$
999,541
  
$
1,415,928
  
$
1,936,325
  
$
2,842,163
 
Hard dollar payments
  
100,684
   
88,138
   
202,843
   
197,148
 
   
1,100,225
   
1,504,066
   
2,139,168
   
3,039,311
 
Research services
  
-
   
375,000
   
-
   
752,500
 
Underwriting fees
  
-
   
94,177
   
30,488
   
94,177
 
Sales manager fees
  
-
   
122,571
   
334,825
   
122,571
 
  
$
1,100,225
  
$
2,095,814
  
$
2,504,481
  
$
4,008,559