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Accounting policies - Goodwill and intangible assets (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Sep. 30, 2020 customer | Jun. 30, 2021 | Sep. 30, 2020 customer | Dec. 31, 2020 USD ($) customer | Sep. 30, 2021 USD ($)
Goodwill |  |  |  |  | $ 13,325,013 | $ 10,425,013
Retail [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 100.00% |
Estimated Fair Value Carrying Amount Exceeded Percentage |  |  |  |  | 101 |
Goodwill |  |  |  |  | $ 1,170,511 | 1,170,511
Bulk [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 100.00% |
Estimated Fair Value Carrying Amount Exceeded Percentage |  |  |  |  | 49 |
Goodwill |  |  |  |  | $ 1,948,875 | 1,948,875
Services [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 100.00% |
Estimated Fair Value Carrying Amount Exceeded Percentage |  |  |  |  | 17 |
Goodwill |  |  |  |  | $ 5,320,416 | 5,320,416
Manufacturing Units [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 100.00% |
Estimated Fair Value Carrying Amount Exceeded Percentage |  |  |  |  | 31 |
Goodwill |  |  |  |  | $ 4,885,211 | 1,985,211
Discounted Cash Flow Method [Member] | Retail [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 80.00% |
Discounted Cash Flow Method [Member] | Bulk [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 80.00% |
Discounted Cash Flow Method [Member] | Services [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 80.00% |
Discounted Cash Flow Method [Member] | Manufacturing Units [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 80.00% |
Guideline Public Company Method [Member] | Retail [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 20.00% |
Guideline Public Company Method [Member] | Bulk [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 20.00% |
Guideline Public Company Method [Member] | Services [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 20.00% |
Guideline Public Company Method [Member] | Manufacturing Units [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  |  |  | 20.00% |
Aerex |  |  |  |  |  |
Number of customers | customer |  | 1 |  | 1 | 1 |
Aerex | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Percentage of total |  | 81.00% |  | 84.00% | 80.00% |
Aerex | Gross Profit [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Percentage of total |  | 88.00% |  | 86.00% | 89.00% |
Aerex | Manufacturing Units [Member] |  |  |  |  |  |
Estimated Fair Value Carrying Amount Exceeded Percentage |  |  |  | 22 | 31 |
Goodwill |  |  |  |  |  | $ 1,985,211
Impairment of goodwill | $ 2,900,000 |  |  |  |  |
Aerex | Discounted Cash Flow Method [Member] | Manufacturing Units [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  | 80.00% | 80.00% | 80.00% |
Aerex | Guideline Public Company Method [Member] | Manufacturing Units [Member] |  |  |  |  |  |
Estimated Fair Value Percentage Segment Reporting Information |  |  | 20.00% | 20.00% | 20.00% |

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