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Segment information (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Retail [Member]    
Segment Reporting Information [Line Items]    
Depreciation, Depletion and Amortization $ 509,820 $ 587,726
Bulk [Member]    
Segment Reporting Information [Line Items]    
Depreciation, Depletion and Amortization 826,779 827,389
Services [Member]    
Segment Reporting Information [Line Items]    
Depreciation, Depletion and Amortization 22,019 29,038
Manufacturing [Member]    
Segment Reporting Information [Line Items]    
Depreciation, Depletion and Amortization $ 406,489 $ 210,669