Accounting policies (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Total Revenues	$ 65,719,857	$ 59,367,022
Retail revenues [Member]
Total Revenues	25,621,048	23,225,066
Bulk revenues [Member]
Total Revenues	31,031,287	28,682,113
Services revenues [Member]
Total Revenues	1,811,372	469,347
Manufacturing revenues [Member]
Total Revenues	$ 7,256,150	$ 6,990,496