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Cost of revenues and general and administrative expenses - General and administrative expenses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cost of revenues and general and administrative expenses [Line Items]    
General and Administrative Expense $ 18,434,898 $ 17,001,164
Employee costs [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
General and Administrative Expense 10,025,658 9,335,247
Insurance [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
General and Administrative Expense 1,436,957 866,457
Professional fees [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
General and Administrative Expense 1,549,878 1,178,621
Directors' fees and expenses [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
General and Administrative Expense 865,555 969,279
Depreciation [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
General and Administrative Expense 133,477 135,272
Amortization of intangible assets [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
General and Administrative Expense 891,667 841,667
Other [Member]    
Cost of revenues and general and administrative expenses [Line Items]    
General and Administrative Expense $ 3,531,706 $ 3,674,621