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Accounting policies - Goodwill and intangible assets (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Oct. 31, 2022 | Sep. 30, 2022
Goodwill | $ 10,425,013 |  | $ 10,425,013
Intangible assets, net | $ 3,401,666 |  | 2,959,166
Retail [Member] |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage | 32 |  |
Goodwill | $ 1,170,511 |  | 1,170,511
Bulk [Member] |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage | 51 |  |
Goodwill | $ 1,948,875 |  | 1,948,875
Services [Member] |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage | 15 |  |
Goodwill | $ 5,320,416 |  | 5,320,416
Intangible assets, net | $ 2,553,888 |  | 2,181,388
Manufacturing Units [Member] |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage | 15 |  |
Goodwill | $ 1,985,211 |  | 1,985,211
Intangible assets, net | $ 847,778 |  | 777,778
Discounted Cash Flow Method [Member] |  |  |
Estimated Fair Value Percentage Segment Reporting Information | 80.00% |  |
Guideline Public Company Method [Member] |  |  |
Estimated Fair Value Percentage Segment Reporting Information | 20.00% |  |
Aerex | Manufacturing Units [Member] |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage | 15 |  |
Goodwill |  |  | 1,985,211
Intangible assets, net |  |  | $ 777,778
PERC Water Corporation |  |  |
Ownership interest acquired |  | 39.00% |

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