Revenue Recognition - Schedule of Recognition of Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenue Outside the Scope of Topic 606
Total Revenue	$ 31,174,000	$ 14,874,000	$ 54,644,000	$ 43,793,000
Advisory fees [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	1,035,000	791,000	2,045,000	1,539,000
Market making [Member]
Revenue Outside the Scope of Topic 606
Total Revenue	334,000	497,000	879,000	1,049,000
Retail fees (rebates) [Member] \| Stock borrow / stock loan [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	8,000	4,000	17,000	10,000
Stock locate services [Member] \| Stock borrow / stock loan [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	7,419,000	5,957,000	12,278,000	9,989,000
Marketing and distribution fees [Member] \| Interest, marketing and distribution fees [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	642,000	518,000	1,281,000	1,018,000
Riskless principal transactions with customers [Member] \| Principal transactions and proprietary trading [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	5,871,000	2,453,000	10,107,000	6,161,000
Brokerage commissions [Member] \| Commissions and fees [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	2,256,000	1,515,000	4,054,000	3,058,000
Distribution fees [Member] \| Commissions and fees [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	371,000	343,000	763,000	701,000
Insurance commissions [Member] \| Commissions and fees [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	33,000	156,000	168,000	357,000
Underwriting fees [Member] \| Investment Banking [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	1,551,000	206,000	2,899,000	206,000
Financial advisory fees [Member] \| Investment Banking [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	884,000		1,109,000
Administrative fees [Member] \| Other income [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	579,000	426,000	966,000	857,000
Payment for order flow \| Other income [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	782,000	413,000	1,436,000	756,000
Music and artist services revenue [Member]
Revenue Outside the Scope of Topic 606
Total Revenue	169,000	113,000	417,000	113,000
Music and artist services revenue [Member] \| Other income [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	169,000	113,000	417,000	113,000
NIL revenue [Member]
Revenue Outside the Scope of Topic 606
Total Revenue	112,000		207,000
NIL revenue [Member] \| Other income [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	112,000		207,000
Revenues from Contracts with Customers [Member]
Principal transactions and proprietary trading
Total Revenues from contracts with customers	21,712,000	12,895,000	37,747,000	24,765,000
Stock rebate revenue [Member] \| Stock borrow / stock loan [Member]
Revenue Outside the Scope of Topic 606
Total Revenue	3,364,000	1,561,000	5,327,000	2,360,000
Margin interest [Member] \| Interest, marketing and distribution fees [Member]
Revenue Outside the Scope of Topic 606
Total Revenue	3,197,000	3,513,000	6,030,000	6,908,000
Interest income [Member] \| Interest, marketing and distribution fees [Member]
Revenue Outside the Scope of Topic 606
Total Revenue	2,346,000	2,838,000	4,748,000	5,888,000
Proprietary trading [Member] \| Principal transactions and proprietary trading [Member]
Revenue Outside the Scope of Topic 606
Total Revenue	221,000	373,000	(87,000)	393,000
Investment in Equity Security [Member] \| Principal transactions and proprietary trading [Member]
Revenue Outside the Scope of Topic 606
Total Revenue		(6,803,000)		2,430,000
Revenue Outside the Scope of Topic 606 [Member]
Revenue Outside the Scope of Topic 606
Total Revenue	$ 9,462,000	$ 1,979,000	$ 16,897,000	$ 19,028,000