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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 2,188	$ 4,086	$ 6,052	$ 7,542
Post-retirement benefit plan adjustments:
Amortization of net actuarial loss	45	44	87	87
Amortization of prior service credits	(125)	(124)	(248)	(248)
Income tax benefit	17	16	34	33
Comprehensive income	$ 2,125	$ 4,022	$ 5,925	$ 7,414

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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