Accounting policies - Disaggregated revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Total Revenue	$ 19,557,905	$ 17,103,317
Minimum [Member]
Contracts in progress
Number of days after consumption billings are collected	30 days
Maximum [Member]
Contracts in progress
Number of days after consumption billings are collected	45 days
Retail revenue [Member]
Total Revenue	$ 6,313,200	5,711,305
Bulk revenue [Member]
Total Revenue	7,350,644	6,245,970
Services revenue [Member]
Total Revenue	4,743,820	3,540,846
Manufacturing revenue [Member]
Total Revenue	$ 1,150,241	$ 1,605,196