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Segment information - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Retail [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization $ 632,953 $ 595,247 $ 1,267,208 $ 1,200,060
Bulk [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization 906,292 967,064 1,860,052 1,934,299
Services [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization 204,000 188,586 404,495 371,337
Manufacturing Units [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization $ 70,134 $ 82,340 $ 145,667 $ 208,474