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Capital Requirements (Details) - USD ($)
Jan. 02, 2025
Dec. 31, 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   $ 204,587,000   $ 274,317,000
Securities   68,800,000   115,500,000
Excess deposit requirements amount   1,200,000   1,000,000
MSCO [Member]        
Capital Requirements [Line Items]        
Net capital   $ 63,900,000   $ 56,100,000
Percentage of aggregate debit balance to net capital   65.84%   63.42%
Net capital excess required   $ 62,000,000   $ 54,300,000
Required net capital   1,900,000   1,800,000
Cash and securities deposits   203,300,000   273,100,000
Cash   134,500,000   157,600,000
Cash deposits in excess of minimum requirement   9,500,000 $ 3,200,000 26,200,000
Excess deposit requirements amount   193,800,000   246,900,000
Special reserve account   1,300,000   1,200,000
Reserve account excess amount   100,000   200,000
RISE [Member]        
Capital Requirements [Line Items]        
Required net capital   250,000   250,000
Subsequent Event [Member] | MSCO [Member]        
Capital Requirements [Line Items]        
Cash deposits in excess of minimum requirement $ 1,700,000      
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