Capital Requirements (Details) - USD ($)	Jul. 01, 2024	Jun. 30, 2024	Jan. 02, 2024	Dec. 31, 2023
Capital Requirements [Line Items]
Net capital		$ 1,000,000
Percentage of aggregate debit balance to net capital		2.00%
Cash		$ 128,000,000		$ 158,800,000
Excess deposit requirements amount		1,100,000		1,000,000
MSCO [Member]
Capital Requirements [Line Items]
Net capital		$ 60,900,000		$ 56,100,000
Percentage of aggregate debit balance to net capital		70.70%		63.42%
Excess of its required net capital		$ 59,200,000		$ 54,300,000
Required net capital		1,700,000		1,800,000
Cash and securities deposits		213,400,000		273,100,000
Cash		126,800,000		157,600,000
Securities deposits		86,600,000		115,500,000
Cash deposits in excess of minimum requirement	$ 3,200,000	27,200,000	$ 3,200,000	26,200,000
Excess deposit requirements amount		186,200,000		246,900,000
Special reserve account		1,300,000		1,200,000
Reserve account excess amount		200,000		200,000
RISE [Member]
Capital Requirements [Line Items]
Required net capital		250,000		250,000
Maximum [Member] | RISE [Member]
Capital Requirements [Line Items]
Net capital		1,300,000		1,300,000
Minimum [Member] | RISE [Member]
Capital Requirements [Line Items]
Net capital in excess amount		$ 1,000,000		$ 1,000,000