Real Estate (Summary of Loss from Discontinued Operations) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
REVENUES
Rental revenues	$ 20,824,000	$ 42,472,000
Other revenues	102,000	157,000
Total revenues	20,926,000	42,629,000
EXPENSES
Operating, maintenance and management	4,386,000	9,236,000
Real estate and other property-related taxes	3,278,000	6,534,000
Corporate general and administrative	91,000	151,000
Depreciation and amortization	3,964,000	9,726,000
Total expenses	11,719,000	25,647,000
OPERATING INCOME	9,207,000	16,982,000
NON-OPERATING INCOME AND EXPENSES
Interest expense, net	(1,509,000)	(3,036,000)
Total non-operating income and expenses	(1,509,000)	(3,036,000)
INCOME FROM DISCONTINUED OPERATIONS	7,698,000	13,946,000
Impairment charges	(16,119,000)	(16,630,000)
Total loss from discontinued operations	$ (8,421,000)	$ (2,684,000)