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Accounting policies - Weighted the fair values estimated (Details)		3 Months Ended		12 Months Ended
	Jan. 24, 2020 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($) customer	Jan. 31, 2020	Dec. 31, 2018 USD ($)	Feb. 11, 2016 USD ($)
Goodwill				$ 13,325,013	$ 13,325,013
Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information				100.00%	100.00%
Estimated Fair Value Carrying Amount Exceeded Percentage				101	74
Goodwill				$ 1,170,511	$ 1,170,511
Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information				100.00%	100.00%
Estimated Fair Value Carrying Amount Exceeded Percentage				49	58
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%	100.00%
Estimated Fair Value Carrying Amount Exceeded Percentage				31
Goodwill				$ 4,885,211	$ 4,885,211
Discounted Cash Flow Method [Member] | Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information				80.00%	80.00%
Discounted Cash Flow Method [Member] | Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information				80.00%	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%	80.00%
Guideline Public Company Method [Member] | Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information				20.00%	10.00%
Guideline Public Company Method [Member] | Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information				20.00%	10.00%
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%	10.00%
Mergers And Acquisitions Method [Member] | Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information					10.00%
Mergers And Acquisitions Method [Member] | Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information					10.00%
Mergers And Acquisitions Method [Member] | Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information					10.00%
Aerex
Ownership interest acquired	49.00%					49.00%		51.00%
Amount of remaining ownership purchased	$ 8,500,000
Goodwill		$ 4,885,211	$ 6,285,211					$ 8,035,211
Impairment of goodwill		$ 1,400,000	$ 1,750,000
Number of customers | customer				1	1
Aerex | Revenue Benchmark [Member]
Percentage of total				80.00%	68.00%
Aerex | Gross Profit [Member]
Percentage of total				89.00%	68.00%
CW Belize [Member]
Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent							$ 380,000

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