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Segment information (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Retail [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization $ 615,363 $ 504,616 $ 1,133,377 $ 1,007,629
Bulk [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization 976,437 763,490 1,924,126 1,527,037
Services [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization 1,137 7,639 2,273 15,277
Manufacturing Units [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization $ 215,713 $ 399,426 $ 492,766 $ 798,720