Consolidated Statements of Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income attributable to common stockholders
Net income (loss)	$ 4,235,000	$ (1,821,000)	$ 757,000
Other comprehensive income:
Unrealized (loss) gain on available-for-sale securities	(191,000)	(100,000)	62,000
Benefit plan adjustments	(189,000)	404,000	(371,000)
Unrealized interest rate swap gains	988,000
Unrealized interest rate swap gains		970,000	1,040,000
Other comprehensive income before taxes	565,000	1,602,000	945,000
Provision for income taxes related to other comprehensive income items	(158,000)	(627,000)	(282,000)
Other comprehensive income	407,000	975,000	663,000
Comprehensive income (loss)	4,642,000	(846,000)	1,420,000
Comprehensive (loss) income attributable to non-controlling interests	(20,000)	(24,000)	(43,000)
Comprehensive income (loss) attributable to common stockholders	4,662,000	(822,000)	1,463,000
SERP
Other comprehensive income:
Benefit plan adjustments	$ (43,000)	$ 328,000	$ 214,000