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Accounting policies - Additional Information (Details) gal in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 11, 2020 USD ($) | Jan. 24, 2020 USD ($) | Dec. 31, 2021 USD ($) gal | Dec. 31, 2020 USD ($) | Dec. 31, 2019
Foreign Currency Transaction Gain (Loss), before Tax [Abstract] |  |  |  |  |
Interest Costs Capitalized |  |  | $ 0 | $ 0 |
Foreign Currency Transaction Gain (Loss), before Tax |  |  | $ 32,594 | 68,818 |
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 |  |  | $ 2,700,000 | 2,500,000 |
Amortization of Other Deferred Charges |  |  | $ 179,353 | 179,353 |
Amount required to reduce the amount of water lost by the public water distribution system | gal |  |  | 438 |  |
Contracts in progress |  |  |  |  |
Number of days after consumption billings are considered past due |  |  | 45 days |  |
Revenue |  |  | $ 66,863,502 | $ 72,628,126 |
Aerex |  |  |  |  |
Ownership interest held |  | 100.00% |  |  |
Cash |  | $ 8,500,000 |  |  |
PERC Water Corporation |  |  |  |  |
Ownership interest held | 61.00% |  |  |  |
Cash | $ 900,000 |  |  |  |
Minimum [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Number of days after consumption billings are collected |  |  | 30 days |  |
Maximum [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Number of days after consumption billings are collected |  |  | 45 days |  |
Percentage Of Bad Debts |  |  |  | 1.00% | 1.00%
Bahamas [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Revenue |  |  | $ 24,031,547 | $ 21,654,153 |
Aerex |  |  |  |  |
Ownership interest acquired |  | 49.00% |  |  |
PERC Water Corporation |  |  |  |  |
Ownership interest acquired | 10.00% |  |  |  |
Retail [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Revenue |  |  | 22,104,953 | 22,952,370 |
Bulk [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Revenue |  |  | 26,800,869 | 24,312,546 |
Services [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Revenue |  |  | 13,884,857 | 12,937,859 |
Manufacturing Units [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Revenue |  |  | 4,072,823 | 12,425,351 |
Bulk revenue [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Revenue |  |  | 26,800,869 | 24,312,546 |
Capitalized Engineering Labor and Materials Cost [Member] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax [Abstract] |  |  |  |  |
Other Assets |  |  | $ 3,500,000 | $ 3,500,000 |

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