Investments - Narrative (Details) - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
SERP investments	$ 801,000		$ 801,000
SERP investments at fair value	2,173,000		2,317,000
CoBank
Schedule of Equity Method Investments [Line Items]
SERP investments at fair value	10,000,000		$ 10,300,000
Other nonoperating income (expense)	$ 100,000	$ 1,000,000
Percentage of patronage credit paid in cash	75.00%
Percentage of patronage credit paid in share	25.00%
Valley Network Partnership
Schedule of Equity Method Investments [Line Items]
Ownership interest, percentage	20.00%		20.00%
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Revenue from related parties	$ 200,000
Related party costs	$ 28,200	$ 500,000

Represents the percentage of patronage credits paid in cash by the entity.

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SERP Investments, Current

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold.

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