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Accounting policies (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Disaggregation of Revenue [Table Text Block]
The following table presents the Company’s revenues disaggregated by revenue source (unaudited).
 
 
 
Three Months Ended June 30,
 
 
Six Months Ended June 30,
 
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
Retail revenues
 
$
6,268,023
 
 
$
6,064,016
 
 
$
12,699,371
 
 
$
12,540,620
 
Bulk revenues
 
 
8,488,850
 
 
 
8,043,921
 
 
 
16,717,365
 
 
 
15,734,323
 
Services revenues
 
 
122,912
 
 
 
119,204
 
 
 
246,676
 
 
 
249,456
 
Manufacturing revenues
 
 
992,430
 
 
 
1,056,047
 
 
 
1,545,198
 
 
 
2,435,895
 
Total revenues
 
$
15,872,215
 
 
$
15,283,188
 
 
$
31,208,610
 
 
$
30,960,294