QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 212	$ 101	$ 101
Operating (expense)	(57)	(77)	(72)
Corporate general and administrative expense	(317)	(360)	(396)
Income (loss) allocable to common shareholders	181	78	1,916
First Quarter [Member]
Effect of Fourth Quarter Events [Line Items]
Revenue	45	26	25
Operating (expense)	(12)	(18)	(18)
Corporate general and administrative expense	(80)	(74)	(104)
Other income (expense) net	52	145	60
Income (loss) allocable to common shareholders	$ 5	$ 79	$ (97)
Earnings Per Share, Basic	$ 0.01	$ 0.01	$ 0.02
Second Quarter [Member]
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 47	$ 26	$ 25
Operating (expense)	(13)	(20)	(18)
Corporate general and administrative expense	(80)	(111)	(127)
Other income (expense) net	184	154	60
Income (loss) allocable to common shareholders	$ 138	$ 49	$ (1,367)
Earnings Per Share, Basic	$ 0.02	$ 0.01	$ (0.03)
Third Quarter [Member]
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 63	$ 25	$ 25
Operating (expense)	(18)	(34)	(18)
Corporate general and administrative expense	(71)	(53)	(65)
Other income (expense) net	53	54	137
Income (loss) allocable to common shareholders	$ 27	$ (8)	$ 2,182
Earnings Per Share, Basic	$ 0.01	$ (0.01)	$ (0.43)
Fourth Quarter [Member]
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 57	$ 25	$ 26
Operating (expense)	(14)	(5)	(18)
Corporate general and administrative expense	(86)	(122)	(100)
Other income (expense) net	54	53	58
Income (loss) allocable to common shareholders	$ 11	$ (49)	$ (32)
Earnings Per Share, Basic	$ 0.01	$ 0.00	$ 0.00