Accounting policies - Goodwill and intangible assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2022
Goodwill	$ 10,425,013	$ 10,425,013
Intangible assets, net	$ 3,401,666	3,254,166
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	2,429,721
Manufacturing Units [Member]
Estimated Fair Value Carrying Amount Exceeded Percentage	15
Goodwill	$ 1,985,211	1,985,211
Intangible assets, net	$ 847,778	824,445
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		824,445
PERC Water Corporation | Services [Member]
Estimated Fair Value Carrying Amount Exceeded Percentage	15
Goodwill		5,320,416
Intangible assets, net		$ 2,429,721