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Accounting policies - Goodwill and intangible assets (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Jun. 30, 2022
Goodwill | $ 10,425,013 | $ 10,425,013
Intangible assets, net | $ 3,401,666 | 3,106,667
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 | 2,305,556
Manufacturing Units [Member] |  |
Estimated Fair Value Carrying Amount Exceeded Percentage | 15 |
Goodwill | $ 1,985,211 | 1,985,211
Intangible assets, net | $ 847,778 | 801,111
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 |  | $ 801,111

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