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Accounting policies - Disaggregated revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total Revenue	$ 16,413,146	$ 17,666,257	$ 50,217,987	$ 57,479,225
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	5,247,042	4,993,069	$ 16,633,137	18,216,797
Bulk revenue [Member]
Total Revenue	6,868,134	6,061,475	19,826,075	18,368,156
Services revenue [Member]
Total Revenue	3,210,584	3,351,935	10,514,669	9,942,748
Manufacturing revenue [Member]
Total Revenue	$ 1,087,386	$ 3,259,778	$ 3,244,106	$ 10,951,524

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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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