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Investments - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
SERP investments at fair value		$ 2,027,000		$ 2,027,000		$ 1,889,000
CoBank
Schedule of Equity Method Investments [Line Items]
SERP investments at fair value		10,000,000		10,000,000
Other nonoperating income (expense)		$ 100,000	$ 13,700	$ 400,000	$ 40,500
Percentage of patronage credit paid in cash		88.00%		88.00%
Percentage of patronage credit paid in share		12.00%		12.00%
Valley Network Partnership
Schedule of Equity Method Investments [Line Items]
Ownership interest, percentage		20.00%		20.00%		20.00%
Distribution of capital	$ 100,000

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