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Accounting policies - Investments and Other assets (Details) gal in Millions | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) gal | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Criteria for recognizing investment at cost | Investments where the Company does not exercise significant influence over the operating and financial policies of the investee and holds less than 20% of the voting stock are recorded at cost. |  |
Equity Method Investment, Additional Information | The Company uses the equity method of accounting for investments in common stock where the Company holds 20% to 50% of the voting stock of the investee and has significant influence over its operating and financial policies but does not meet the criteria for consolidation. |  |
Accumulated Amortization of Other Deferred Costs | $ 3,100,000 | $ 3,100,000 | $ 2,900,000
Amortization of Other Deferred Charges |  | 179,353 |
Amount required to reduce the amount of water lost by the public water distribution system | gal | 438 |  |
Capitalized Engineering Labor and Materials Cost [Member] |  |  |
Other Assets | $ 3,500,000 | $ 3,500,000 |

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