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Segment information (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Retail [Member]    
Segment Reporting Information [Line Items]    
Depreciation, Depletion and Amortization $ 503,013 $ 509,820
Bulk [Member]    
Segment Reporting Information [Line Items]    
Depreciation, Depletion and Amortization 809,148 826,779
Services [Member]    
Segment Reporting Information [Line Items]    
Depreciation, Depletion and Amortization 7,638 22,019
Manufacturing [Member]    
Segment Reporting Information [Line Items]    
Depreciation, Depletion and Amortization $ 399,294 $ 406,489