Capital Requirements (Details) - USD ($)	Apr. 01, 2022	Mar. 31, 2022	Jan. 03, 2022	Dec. 31, 2021
MSCO [Member]
Net capital		$ 30,500,000		$ 36,400,000
Minimum net capital required		1,800,000		2,100,000
Net capital in excess of minimum requirement		$ 28,700,000		$ 34,300,000
Percentage of aggregate debit balance to net capital		33.40%		34.90%
Cash deposits		$ 278,600,000		$ 326,800,000
Minimum cash deposits required		274,100,000		294,900,000
Cash deposits in excess of minimum requirement	$ 11,500,000	4,500,000	$ 1,900,000	31,900,000
RISE [Member]
Minimum net capital required		250,000		250,000
RISE [Member] | Minimum [Member]
Net capital		1,700,000		1,700,000
RISE [Member] | Maximum [Member]
Net capital		$ 1,500,000		$ 1,400,000