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Fair Value Measurements (Details) - Schedule of Financial Assets and Liabilities Measured at Fair Value - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Securities owned, at fair value    
Total Securities owned, at fair value $ 16,768,000 $ 18,038,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 2,000 2,000
Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 15,043,000 17,784,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 2,000
Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 1,725,000 254,000
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 2,000
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 sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 2,000 2,000
Equity Securities [Member] | Level 1 [Member]    
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 2,000
Equity Securities [Member] | Level 2 [Member]    
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value 2,000
Equity Securities [Member] | Level 3 [Member]    
Securities sold, not yet purchased, at fair value    
Total Securities sold, not yet purchased, at fair value
US Government Agencies Debt Securities [Member]    
Cash and securities segregated for regulatory purposes    
Cash and securities segregated for regulatory purposes 86,554,000 115,515,000
Securities owned, at fair value    
Total Securities owned, at fair value 14,947,000 17,636,000
US Government Agencies Debt Securities [Member] | Level 1 [Member]    
Cash and securities segregated for regulatory purposes    
Cash and securities segregated for regulatory purposes 86,554,000 115,515,000
Securities owned, at fair value    
Total Securities owned, at fair value 14,947,000 17,636,000
US Government Agencies Debt 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
US Government Agencies Debt 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 113,000 114,000
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 113,000 114,000
Certificates of Deposit [Member] | Level 3 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Municipal Notes [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 222,000  
Municipal Notes [Member] | Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value  
Municipal Notes [Member] | Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 222,000  
Municipal Notes [Member] | Level 3 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value  
Corporate Bond Securities [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 59,000 3,000
Corporate Bond Securities [Member] | Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Corporate Bond Securities [Member] | Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 59,000 3,000
Corporate Bond Securities [Member] | Level 3 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value
Equity Securities [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 1,427,000 283,000
Equity Securities [Member] | Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 96,000 146,000
Equity Securities [Member] | Level 2 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value 1,331,000 137,000
Equity Securities [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   2,000
Options [Member] | Level 1 [Member]    
Securities owned, at fair value    
Total Securities owned, at fair value   2,000
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