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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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