Fair Value Measurements (Details) - Schedule of Financial Assets and Liabilities Measured at Fair Value - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Assets
Total Securities owned, at fair value	$ 19,270,000	$ 18,038,000
Securities sold, not yet purchased, at fair value
Total Securities sold, not yet purchased, at fair value	1,000	2,000
Level 1 [Member]
Assets
Total Securities owned, at fair value	17,901,000	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]
Assets
Total Securities owned, at fair value	1,369,000	254,000
Securities sold, not yet purchased, at fair value
Total Securities sold, not yet purchased, at fair value	1,000
Level 3 [Member]
Assets
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]
Assets
Total Securities owned, at fair value	1,153,000
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]
Assets
Total Securities owned, at fair value	76,000
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]
Assets
Total Securities owned, at fair value	1,077,000
Securities sold, not yet purchased, at fair value
Total Securities sold, not yet purchased, at fair value	1,000
Equity securities [Member] \| Level 3 [Member]
Assets
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]
Assets
Cash and securities segregated for regulatory purposes	100,440,000	115,515,000
U.S. government securities [Member] \| Level 1 [Member]
Assets
Cash and securities segregated for regulatory purposes	100,440,000	115,515,000
U.S. government securities [Member] \| Level 2 [Member]
Assets
Cash and securities segregated for regulatory purposes
U.S. government securities [Member] \| Level 3 [Member]
Assets
Cash and securities segregated for regulatory purposes
U.S. government securities [Member]
Assets
Total Securities owned, at fair value	17,825,000	17,636,000
U.S. government securities [Member] \| Level 1 [Member]
Assets
Total Securities owned, at fair value	17,825,000	17,636,000
U.S. government securities [Member] \| Level 2 [Member]
Assets
Total Securities owned, at fair value
U.S. government securities [Member] \| Level 3 [Member]
Assets
Total Securities owned, at fair value
Certificates of deposit [Member]
Assets
Total Securities owned, at fair value	114,000	114,000
Certificates of deposit [Member] \| Level 1 [Member]
Assets
Total Securities owned, at fair value
Certificates of deposit [Member] \| Level 2 [Member]
Assets
Total Securities owned, at fair value	114,000	114,000
Certificates of deposit [Member] \| Level 3 [Member]
Assets
Total Securities owned, at fair value
Municipal securities [Member]
Assets
Total Securities owned, at fair value	154,000
Municipal securities [Member] \| Level 1 [Member]
Assets
Total Securities owned, at fair value
Municipal securities [Member] \| Level 2 [Member]
Assets
Total Securities owned, at fair value	154,000
Municipal securities [Member] \| Level 3 [Member]
Assets
Total Securities owned, at fair value
Corporate bonds [Member]
Assets
Total Securities owned, at fair value	24,000	3,000
Corporate bonds [Member] \| Level 1 [Member]
Assets
Total Securities owned, at fair value
Corporate bonds [Member] \| Level 2 [Member]
Assets
Total Securities owned, at fair value	24,000	3,000
Corporate bonds [Member] \| Level 3 [Member]
Assets
Total Securities owned, at fair value
Options [Member]
Assets
Total Securities owned, at fair value		2,000
Options [Member] \| Level 1 [Member]
Assets
Total Securities owned, at fair value		2,000
Options [Member] \| Level 2 [Member]
Assets
Total Securities owned, at fair value
Options [Member] \| Level 3 [Member]
Assets
Total Securities owned, at fair value
Equity securities [Member]
Assets
Total Securities owned, at fair value		283,000
Equity securities [Member] \| Level 1 [Member]
Assets
Total Securities owned, at fair value		146,000
Equity securities [Member] \| Level 2 [Member]
Assets
Total Securities owned, at fair value		137,000
Equity securities [Member] \| Level 3 [Member]
Assets
Total Securities owned, at fair value