Accounting policies - Disaggregated revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total Revenue	$ 17,666,257	$ 15,889,239	$ 57,479,225	$ 51,183,023
Retail revenue [Member]
Total Revenue	4,993,069	6,271,220	18,216,797	19,941,395
Bulk revenue [Member]
Total Revenue	6,061,475	6,449,757	18,368,156	20,502,121
Services revenue [Member]
Total Revenue	3,351,935	95,980	9,942,748	287,349
Manufacturing revenue [Member]
Total Revenue	$ 3,259,778	$ 3,072,282	$ 10,951,524	$ 10,452,158