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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Securities owned, at fair value    
Total Securities owned, at fair value $ 21,385,000 $ 18,038,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 26,000 2,000
Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 21,199,000 17,784,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 26,000 2,000
Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 186,000 254,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value
Level 3 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value
U.S. Government Securities [Member]    
Cash and securities segregated for regulatory purposes    
Cash and securities segregated for regulatory purposes 68,758,000 115,515,000
Securities owned, at fair value    
Total Securities owned, at fair value 20,086,000 17,636,000
U.S. Government Securities [Member] | Level 1 [Member]    
Cash and securities segregated for regulatory purposes    
Cash and securities segregated for regulatory purposes 68,758,000 115,515,000
Securities owned, at fair value    
Total Securities owned, at fair value 20,086,000 17,636,000
U.S. Government Securities [Member] | Level 2 [Member]    
Cash and securities segregated for regulatory purposes    
Cash and securities segregated for regulatory purposes
Securities owned, at fair value    
Total Securities owned, at fair value
U.S. Government Securities [Member] | Level 3 [Member]    
Cash and securities segregated for regulatory purposes    
Cash and securities segregated for regulatory purposes
Securities owned, at fair value    
Total Securities owned, at fair value
Certificates of Deposit [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 112,000 114,000
Certificates of Deposit [Member] | Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Certificates of Deposit [Member] | Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 112,000 114,000
Certificates of Deposit [Member] | Level 3 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Corporate Bonds [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 2,000 3,000
Corporate Bonds [Member] | Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Corporate Bonds [Member] | Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 2,000 3,000
Corporate Bonds [Member] | Level 3 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Options [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 58,000 2,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 25,000  
Options [Member] | Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 58,000 2,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 25,000  
Options [Member] | Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Options [Member] | Level 3 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value  
Equity Securities [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 1,127,000 283,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 1,000 2,000
Equity Securities [Member] | Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 1,055,000 146,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 1,000 2,000
Equity Securities [Member] | Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 72,000 137,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value
Equity Securities [Member] | Level 3 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value