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Accounting policies - Disaggregated revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total Revenue	$ 16,701,524	$ 19,087,247	$ 33,804,841	$ 39,812,968
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			35 days
Retail revenue [Member]
Total Revenue	5,674,790	5,966,296	$ 11,386,095	13,223,728
Bulk revenue [Member]
Total Revenue	6,711,971	5,866,397	12,957,941	12,306,681
Services revenue [Member]
Total Revenue	3,763,239	3,476,000	7,304,085	6,590,813
Manufacturing revenue [Member]
Total Revenue	$ 551,524	$ 3,778,554	$ 2,156,720	$ 7,691,746

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- Definition

The number of days after consumption billings are collected.

+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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