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Summary of Significant Accounting Policies - Schedule of Company’s Recognition of Revenue From Contracts With Customers As Well As Revenues From Financial Instruments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Principal transactions and proprietary trading    
Riskless principal transactions with customers $ 14,130,000 $ 9,096,000
Commissions and fees    
Commissions and fees 9,615,000 7,276,000
Stock borrow / stock loan    
Stock borrow / stock loan 19,249,000 16,172,000
Market making 2,255,000 1,304,000
Total revenue outside the scope of ASC 606 37,510,000 38,228,000
Total Revenue 83,901,000 71,514,000
Other income    
Other income 3,390,000 2,163,000
Advisory fees 2,369,000 1,928,000
Total revenues from contracts with customers 46,391,000 33,286,000
Revenue outside the scope of Topic 606    
Proprietary trading 14,616,000 13,094,000
Interest, marketing and distribution fees    
Interest, marketing and distribution fees 32,407,000 29,577,000
Brokerage Commissions [Member]    
Commissions and fees    
Commissions and fees 7,629,000 5,927,000
Distribution fees [Member]    
Commissions and fees    
Commissions and fees 1,365,000 1,167,000
Insurance commissions [Member]    
Commissions and fees    
Commissions and fees 621,000 447,000
Retail fees (rebates) [Member]    
Stock borrow / stock loan    
Stock borrow / stock loan (5,000) (78,000)
Stock locate services [Member]    
Stock borrow / stock loan    
Stock borrow / stock loan 16,892,000 12,901,000
Administrative fees [Member]    
Other income    
Other income 1,888,000 519,000
Payment for order flow [Member]    
Other income    
Other income 1,454,000 1,114,000
Other commissions [Member]    
Other income    
Other income 48,000 265,000
Proprietary trading [Member]    
Revenue outside the scope of Topic 606    
Proprietary trading 486,000 3,997,000
Margin interest [Member]    
Interest, marketing and distribution fees    
Interest, marketing and distribution fees 15,440,000 16,236,000
Interest income [Member]    
Interest, marketing and distribution fees    
Interest, marketing and distribution fees 14,933,000 11,618,000
Marketing and distribution fees [Member]    
Interest, marketing and distribution fees    
Interest, marketing and distribution fees 2,034,000 1,724,000
Stock rebate revenue [Member]    
Stock borrow / stock loan    
Stock borrow / stock loan $ 2,362,000 $ 3,349,000