Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Measurements [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value

The tables below present, by level within the fair value hierarchy, financial assets and liabilities measured at fair value on a recurring basis for the periods indicated. As required by ASC Topic 820, financial assets and financial liabilities are classified in their entirety based on the lowest level of input that is significant to the respective fair value measurement.

	As of December 31, 2023
	Level 1		Level 2		Level 3		Total
Assets
Cash and securities segregated for regulatory purposes
U.S. government securities	$	115,515,000	$	—	$	—	$	115,515,000
Securities owned, at fair value
U.S. government securities	$	17,636,000	$	—	$	—	$	17,636,000
Certificates of deposit		—		114,000		—		114,000
Corporate bonds		—		3,000		—		3,000
Options		2,000		—		—		2,000
Equity securities		146,000		137,000		—		283,000
Total Securities owned, at fair value	$	17,784,000	$	254,000	$	—	$	18,038,000
Liabilities
Securities sold, not yet purchased, at fair value
Equity securities	$	2,000	$	—	$	—	$	2,000
Total Securities sold, not yet purchased, at fair value	$	2,000	$	—	$	—	$	2,000

	As of December 31, 2022
	Level 1		Level 2		Level 3		Total
Assets
Cash and securities segregated for regulatory purposes
U.S. government securities	$	140,978,000	$	—	$	—	$	140,978,000
Securities owned, at fair value
U.S. government securities	$	2,808,000	$	—	$	—	$	2,808,000
Certificates of deposit		—		92,000		—		92,000
Municipal securities		—		52,000		—		52,000
Corporate bonds		—		7,000		—		7,000
Equity securities		63,000		182,000		—		245,000
Total Securities owned, at fair value	$	2,871,000	$	333,000	$	—	$	3,204,000
Liabilities
Securities sold, not yet purchased, at fair value
Equity securities	$	2,000	$	—	$	—	$	2,000
Total Securities sold, not yet purchased, at fair value	$	2,000	$	—	$	—	$	2,000

Schedule of U.S. Government Securities Market Values and Maturity Dates

The Company had U.S. government securities, certificates of deposit, municipal securities, and corporate bonds with the market values and maturity dates for the periods indicated below:

	As of December 31, 2023
Maturing in 2023	$	30,000,000
Maturing in 2024		98,931,000
Maturing in 2025		3,965,000
Maturing after 2025		115,000
Accrued interest		257,000
Total Market value	$	133,268,000

	As of December 31, 2022
Maturing in 2023	$	106,873,000
Maturing in 2024		36,506,000
Maturing after 2024		150,000
Accrued interest		409,000
Total Market value	$	143,938,000

Schedule of Estimated Fair Values

The estimated fair values for these amounts were determined using significant unobservable inputs (Level 3).

	As of December 31
	2023		2022
Equity method investment in related party	$	—	$	2,584,000