OTHER INVESTMENTS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Investments [Line Items]
Partnerships owning real estate and related	$ 71,000	$ 409,000	$ 235,000	$ 536,000
Partnerships owning diversified businesses	0	61,000	8,000	97,000
Technology and related investments	0	0	14,000	0
Income from investment in 49% owned affiliate (T.G.I.F. Texas, Inc. "TGIF")	(3,000)	9,000	(17,000)	21,000
Total net income from other investments	$ 68,000	$ 479,000	$ 240,000	$ 654,000