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L. QUARTERLY DATA (UNAUDITED) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue     $ 123
Operating (expense)     59
1st Quarter [Member]      
Revenue $ 25 $ 24 37
Operating (expense) (18) (15) (15)
Corporate general and administrative expense (104) (88) (75)
Other income (expense) net 60 60 5
Income (loss) allocable to common shareholders (97) 126 (134)
Income (loss) per common share – basic (0) 0 (0)
2nd Quarter [Member]      
Revenue 25 24 36
Operating (expense) (18) (15) (15)
Corporate general and administrative expense (127) (134) (108)
Other income (expense) net 60 213 5
Income (loss) allocable to common shareholders (137) (141) (174)
Income (loss) per common share – basic (0) (0) (0)
3rd Quarter [Member]      
Revenue 25 25 25
Operating (expense) (18) (15) (15)
Corporate general and administrative expense (65) (92) (99)
Other income (expense) net 137 106 5
Income (loss) allocable to common shareholders 2,182 (2,320) (121)
Income (loss) per common share – basic 0 (0) (0)
4th Quarter [Member]      
Revenue 26 25 25
Operating (expense) (18) (16) (14)
Corporate general and administrative expense (100) (104) (77)
Other income (expense) net 58 62 15
Income (loss) allocable to common shareholders (32) (17) (4)
Income (loss) per common share – basic $ 0 $ 0 $ 0