QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 152	$ 212	$ 101
Operating (expense)	(57)	(57)	(77)
Corporate general and administrative expense	(338)	(317)	(360)
Income (loss) allocable to common shareholders	$ (21)	$ 181	$ 70
Income (loss) per common share - basic	$ (0.01)	$ 0.04	$ 0.01
Income (loss) per common share - diluted	$ (0.01)	$ 0.04	$ 0.01
First Quarter [Member]
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 45	$ 45	$ 26
Operating (expense)	(12)	(12)	(18)
Corporate general and administrative expense	(68)	(80)	(74)
Other income	52	52	145
Income (loss) allocable to common shareholders	$ 17	$ 5	$ 79
Income (loss) per common share - basic	$ 0.01	$ 0.01	$ 0.01
Income (loss) per common share - diluted	$ 0.01	$ 0.01	$ 0.01
Second Quarter [Member]
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 35	$ 47	$ 26
Operating (expense)	(14)	(13)	(20)
Corporate general and administrative expense	(81)	(80)	(111)
Other income	54	184	154
Income (loss) allocable to common shareholders	$ (6)	$ 138	$ 49
Income (loss) per common share - basic	$ (0.01)	$ 0.02	$ 0.01
Income (loss) per common share - diluted	$ (0.01)	$ 0.02	$ 0.01
Third Quarter [Member]
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 35	$ 63	$ 25
Operating (expense)	(15)	(18)	(34)
Corporate general and administrative expense	(70)	(71)	(53)
Other income	57	53	54
Income (loss) allocable to common shareholders	$ 7	$ 27	$ (8)
Income (loss) per common share - basic	$ 0.01	$ 0.01	$ (0.01)
Income (loss) per common share - diluted	$ 0.01	$ 0.01	$ (0.01)
Fourth Quarter [Member]
Effect of Fourth Quarter Events [Line Items]
Revenue	$ 37	$ 57	$ 25
Operating (expense)	(16)	(14)	(5)
Corporate general and administrative expense	(119)	(86)	(122)
Other income	59	54	53
Income (loss) allocable to common shareholders	$ (39)	$ 11	$ (49)
Income (loss) per common share - basic	$ 0.01	$ 0.01	$ 0.00
Income (loss) per common share - diluted	$ 0.01	$ 0.01	$ 0.00