Marketable Securities (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Fair Value [Member]
Securities Financing Transaction [Line Items]
Government securities	$ 16,462,000	$ 14,818,000
Fixed income mutual funds	9,732,000	7,676,000
Certificates of deposit	761,000	6,077,000
Corporate bonds and notes	500,000
Total marketable securities	27,455,000	28,571,000
Cost Basis [Member]
Securities Financing Transaction [Line Items]
Government securities	16,470,000	14,701,000
Fixed income mutual funds	9,630,000	7,585,000
Certificates of deposit	752,000	6,112,000
Corporate bonds and notes	496,000
Total marketable securities	27,348,000	28,398,000
Gross Unrealized Gains [Member]
Securities Financing Transaction [Line Items]
Government securities	63,000	127,000
Fixed income mutual funds	132,000	91,000
Certificates of deposit	9,000
Corporate bonds and notes	4,000
Total marketable securities	208,000	218,000
Gross Unrealized Losses [Member]
Securities Financing Transaction [Line Items]
Government securities	(71,000)	(10,000)
Fixed income mutual funds	(30,000)
Certificates of deposit		(35,000)
Corporate bonds and notes
Total marketable securities	$ (101,000)	$ (45,000)