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Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
SERP investments	$ 0		$ 0		$ 801,000
SERP investments at fair value	1,739,000		1,739,000		2,317,000
CoBank
Schedule of Equity Method Investments [Line Items]
SERP investments at fair value	10,000,000		10,000,000		$ 10,300,000
Other nonoperating income (expense)	$ 13,700	$ 500,000	$ 40,500	$ 1,500,000
Percentage of patronage credit paid in cash	75.00%		75.00%
Percentage of patronage credit paid in share	25.00%		25.00%
Valley Network Partnership
Schedule of Equity Method Investments [Line Items]
Ownership interest, percentage	20.00%		20.00%		20.00%
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Revenue from related parties	$ 100,000	200,000	$ 500,000	500,000
Related party costs	$ 19,200	$ 30,000	$ 73,600	$ 1,100,000

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