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Revenue from Contracts with Customers (Tables)
12 Months Ended
Dec. 31, 2019
Revenue from Contracts with Customers [Abstract]  
Total Revenues by Type
Total revenues from contracts with customers by type were as follows for the years ended December 31, 2019 and 2018:

  
2019
  
2018
 
Commissions
 
$
5,903,200
  
$
5,349,348
 
Hard dollar payments
  
472,875
   
805,219
 
   
6,376,075
   
6,154,567
 
Research services
  
1,502,500
   
2,030,000
 
Underwriting fees
  
431,114
   
102,931
 
Sales manager fees
  
733,422
   
15,616
 
  
$
9,043,111
  
$
8,303,114