Marketable Securities (Details) - Common Stock [Member] - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Cost	$ 5,119,000	$ 10,271,000
Gross unrealized gains	12,000	383,000
Gross unrealized losses	(5,104,000)	(4,064,000)
Fair value	$ 27,000	$ 6,590,000