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Cost of revenues and general and administrative expenses - Cost of revenues (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue $ 45,859,671 $ 40,519,303
Electricity [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue 5,389,361 7,438,218
Depreciation [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue 6,202,012 6,046,810
Fuel oil [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue 4,157,393 5,315,676
Employee costs [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue 11,308,833 6,597,755
Maintenance [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue 2,859,262 2,076,501
Retail license royalties [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue 1,489,862 1,701,724
Insurance [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue 1,491,799 1,279,997
Materials [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue 5,786,698 6,151,064
Other [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
Cost of Revenue $ 7,174,451 $ 3,911,558