Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from Contracts with Customers [Abstract]
Underwriter payment receiving period	90 days
Total Revenues by Type [Abstract]
Total revenues	$ 1,404,256	$ 1,912,745
Brokerage Commissions [Member]
Total Revenues by Type [Abstract]
Total revenues	1,038,943	1,535,245
Commissions [Member]
Total Revenues by Type [Abstract]
Total revenues	936,784	1,426,235
Hard Dollar Payments [Member]
Total Revenues by Type [Abstract]
Total revenues	102,159	109,010
Research Services [Member]
Total Revenues by Type [Abstract]
Total revenues	0	377,500
Underwriting Fees [Member]
Total Revenues by Type [Abstract]
Total revenues	30,488	0
Sales Manager Fees [Member]
Total Revenues by Type [Abstract]
Total revenues	$ 334,825	$ 0