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Segment information (Details Textual) - Continuing Operations [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Retail [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization $ 491,771 $ 567,833 $ 1,514,069 $ 1,714,928
Bulk [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization 1,274,471 811,741 2,928,287 2,480,314
Services [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization 7,638 29,037 37,295 87,113
Manufacturing [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization $ 398,368 $ 422,230 $ 1,204,313 $ 1,126,169