CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 3,265	$ 15,810	$ 5,342
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities	187	(199)	(14)
Unrealized interest rate swap gain	2,285	5,641	2,841
Other comprehensive income before taxes	2,578	6,660	4,024
Provision for income taxes related to other comprehensive income items	(721)	(1,866)	(1,126)
Other comprehensive income	1,857	4,794	2,898
Comprehensive income	5,122	20,604	8,240
Comprehensive income (loss) attributable to non-controlling interests	0	2	(6)
Comprehensive income attributable to common stockholders	5,122	20,602	8,246
Benefit plan adjustments
Other comprehensive income (loss):
Benefit plan adjustments	233	(212)	866
SERP liability adjustments
Other comprehensive income (loss):
Benefit plan adjustments	$ (127)	$ 1,430	$ 331