Real Estate (Summary of Income from Discontinued Operations) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
REVENUES
Rental revenues	$ 21,546,000	$ 21,277,000	$ 43,677,000	$ 43,771,000
Other	102,000	99,000	157,000	221,000
Total revenues	21,648,000	21,376,000	43,834,000	43,992,000
EXPENSES
Operating, maintenance and management	5,108,000	4,454,000	10,441,000	9,916,000
Real estate and other property-related taxes	3,278,000	3,229,000	6,534,000	6,491,000
General and administrative	91,000	(223,000)	151,000	(99,000)
Depreciation and amortization	3,964,000	7,281,000	9,726,000	15,031,000
Total expenses	12,441,000	14,741,000	26,852,000	31,339,000
OPERATING INCOME	9,207,000	6,635,000	16,982,000	12,653,000
NON-OPERATING INCOME AND EXPENSES
Interest expense	(1,509,000)	(1,182,000)	(3,036,000)	(1,709,000)
Total non-operating income and expenses	(1,509,000)	(1,182,000)	(3,036,000)	(1,709,000)
INCOME FROM DISCONTINUED OPERATIONS	7,698,000	5,453,000	13,946,000	10,944,000
Impairment charges	(16,119,000)		(16,630,000)
Gain on sales				1,047,000
Total (loss) income from discontinued operations	$ (8,421,000)	$ 5,453,000	$ (2,684,000)	$ 11,991,000