Fair Value Measurements (Details) - Schedule of estimated fair values - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Securities owned, at fair value
Total Securities owned, at fair value	$ 18,687,000	$ 3,204,000
Securities sold, not yet purchased, at fair value
Total Securities sold, not yet purchased, at fair value	1,000	2,000
U.S. government securities [Member]
Cash and securities segregated for regulatory purposes
Cash and securities segregated for regulatory purposes	118,101,000	140,978,000
U.S. government securities owned [Member]
Securities owned, at fair value
Total Securities owned, at fair value	17,875,000	2,808,000
Certificates of deposit [Member]
Securities owned, at fair value
Total Securities owned, at fair value	113,000	92,000
Municipal securities [Member]
Securities owned, at fair value
Total Securities owned, at fair value	319,000	52,000
Corporate bonds [Member]
Securities owned, at fair value
Total Securities owned, at fair value	131,000	7,000
Equity securities [Member]
Securities owned, at fair value
Total Securities owned, at fair value	249,000	245,000
Securities sold, not yet purchased, at fair value
Total Securities sold, not yet purchased, at fair value	1,000	2,000
Level 1 [Member]
Securities owned, at fair value
Total Securities owned, at fair value	17,992,000	2,871,000
Securities sold, not yet purchased, at fair value
Total Securities sold, not yet purchased, at fair value	1,000	2,000
Level 1 [Member] | U.S. government securities [Member]
Cash and securities segregated for regulatory purposes
Cash and securities segregated for regulatory purposes	118,101,000	140,978,000
Level 1 [Member] | U.S. government securities owned [Member]
Securities owned, at fair value
Total Securities owned, at fair value	17,875,000	2,808,000
Level 1 [Member] | Certificates of deposit [Member]
Securities owned, at fair value
Total Securities owned, at fair value
Level 1 [Member] | Municipal securities [Member]
Securities owned, at fair value
Total Securities owned, at fair value
Level 1 [Member] | Corporate bonds [Member]
Securities owned, at fair value
Total Securities owned, at fair value
Level 1 [Member] | Equity securities [Member]
Securities owned, at fair value
Total Securities owned, at fair value	117,000	63,000
Securities sold, not yet purchased, at fair value
Total Securities sold, not yet purchased, at fair value	1,000	2,000
Level 2 [Member]
Securities owned, at fair value
Total Securities owned, at fair value	695,000	333,000
Securities sold, not yet purchased, at fair value
Total Securities sold, not yet purchased, at fair value
Level 2 [Member] | U.S. government securities [Member]
Cash and securities segregated for regulatory purposes
Cash and securities segregated for regulatory purposes
Level 2 [Member] | U.S. government securities owned [Member]
Securities owned, at fair value
Total Securities owned, at fair value
Level 2 [Member] | Certificates of deposit [Member]
Securities owned, at fair value
Total Securities owned, at fair value	113,000	92,000
Level 2 [Member] | Municipal securities [Member]
Securities owned, at fair value
Total Securities owned, at fair value	319,000	52,000
Level 2 [Member] | Corporate bonds [Member]
Securities owned, at fair value
Total Securities owned, at fair value	131,000	7,000
Level 2 [Member] | Equity securities [Member]
Securities owned, at fair value
Total Securities owned, at fair value	132,000	182,000
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
Level 3 [Member] | U.S. government securities [Member]
Cash and securities segregated for regulatory purposes
Cash and securities segregated for regulatory purposes
Level 3 [Member] | U.S. government securities owned [Member]
Securities owned, at fair value
Total Securities owned, at fair value
Level 3 [Member] | Certificates of deposit [Member]
Securities owned, at fair value
Total Securities owned, at fair value
Level 3 [Member] | Municipal securities [Member]
Securities owned, at fair value
Total Securities owned, at fair value
Level 3 [Member] | Corporate bonds [Member]
Securities owned, at fair value
Total Securities owned, at fair value
Level 3 [Member] | Equity securities [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