MARKETABLE SECURITIES (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Fair Value [Member]
Other Investment Not Readily Marketable [Line Items]
Certificates of deposit	$ 2,997,000	$ 2,976,000
Government securities	26,196,000	20,848,000
Fixed income mutual funds	7,549,000	10,989,000
Corporate bonds and notes	178,000	178,000
Total marketable securities	36,920,000	34,991,000
Cost Basis [Member]
Other Investment Not Readily Marketable [Line Items]
Certificates of deposit	2,976,000	3,019,000
Government securities	25,992,000	20,781,000
Fixed income mutual funds	7,504,000	11,904,000
Corporate bonds and notes	178,000	192,000
Total marketable securities	36,650,000	35,896,000
Gross Unrealized Gains [Member]
Other Investment Not Readily Marketable [Line Items]
Certificates of deposit	21,000
Government securities	204,000	67,000
Fixed income mutual funds	45,000
Corporate bonds and notes
Total marketable securities	270,000	67,000
Gross Unrealized Losses [Member]
Other Investment Not Readily Marketable [Line Items]
Certificates of deposit		(43,000)
Government securities
Fixed income mutual funds		(915,000)
Corporate bonds and notes		(14,000)
Total marketable securities		$ (972,000)