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Segment information - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Retail [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization $ 625,640 $ 596,528 $ 1,892,848 $ 1,796,588
Bulk [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization 761,429 971,914 2,621,481 2,906,213
Services [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization 203,411 191,419 607,906 562,756
Manufacturing Units [Member]        
Segment Reporting Information [Line Items]        
Depreciation, Depletion and Amortization $ 70,679 $ 88,452 $ 216,346 $ 296,926