Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from Contracts with Customers [Abstract]
Underwriter payment receiving period			90 days
Total Revenues by Type [Abstract]
Total revenues	$ 1,066,230	$ 2,358,801	$ 3,570,711	$ 6,367,360
Brokerage Commissions [Member]
Total Revenues by Type [Abstract]
Total revenues	1,066,230	1,510,674	3,205,398	4,549,985
Commissions [Member]
Total Revenues by Type [Abstract]
Total revenues	979,279	1,365,039	2,915,604	4,207,202
Hard Dollar Payments [Member]
Total Revenues by Type [Abstract]
Total revenues	86,951	145,635	289,794	342,783
Research Services [Member]
Total Revenues by Type [Abstract]
Total revenues	0	375,000	0	1,127,500
Underwriting Fees [Member]
Total Revenues by Type [Abstract]
Total revenues	0	4,938	30,488	99,115
Sales Manager Fees [Member]
Total Revenues by Type [Abstract]
Total revenues	$ 0	$ 468,189	$ 334,825	$ 590,760