MARKETABLE SECURITIES (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Fair Value [Member]
Other Investment Not Readily Marketable [Line Items]
Certificates of deposit	$ 5,220,000	$ 2,976,000
Government securities	16,832,000	20,848,000
Fixed income mutual funds	7,524,000	10,989,000
Corporate bonds and notes	179,000	178,000
Total marketable securities	29,755,000	34,991,000
Cost Basis [Member]
Other Investment Not Readily Marketable [Line Items]
Certificates of deposit	5,250,000	3,019,000
Government securities	16,631,000	20,781,000
Fixed income mutual funds	7,650,000	11,904,000
Corporate bonds and notes	193,000	192,000
Total marketable securities	29,724,000	35,896,000
Gross Unrealized Gains [Member]
Other Investment Not Readily Marketable [Line Items]
Certificates of deposit
Government securities	236,000	67,000
Fixed income mutual funds
Corporate bonds and notes
Total marketable securities	236,000	67,000
Gross Unrealized Losses [Member]
Other Investment Not Readily Marketable [Line Items]
Certificates of deposit	(30,000)	(43,000)
Government securities	(35,000)
Fixed income mutual funds	(126,000)	(915,000)
Corporate bonds and notes	(14,000)	(14,000)
Total marketable securities	$ (205,000)	$ (972,000)