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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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