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Revenue from Contracts with Customers (Tables)
3 Months Ended
Mar. 31, 2021
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 ended March 31, 2021 and 2020:

  
Three months ended March 31,
 
  
2021
  
2020
 
Commissions
 
$
591,248
  
$
936,784
 
Hard dollar payments
  
64,360
   
102,159
 
   
655,608
   
1,038,943
 
Underwriting fees
  
-
   
30,488
 
Sales manager fees
  
6,311
   
334,825
 
  
$
661,920
  
$
1,404,256