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Property, plant and equipment - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Construction in process $ 27,445,810   $ 28,627,477
Proceeds from legal settlement, net 1,014,008 $ 0  
Capital Additions | Rollo Bay farm site      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment cost commitment   236,000  
Construction in process      
Property, Plant and Equipment [Line Items]      
Construction in process 2,143,920   2,105,873
Construction in process | Rollo Bay farm site      
Property, Plant and Equipment [Line Items]      
Construction in process 1,700,000    
Equipment      
Property, Plant and Equipment [Line Items]      
Construction in process $ 11,192,849   $ 12,275,619
Proceeds from sale of property, plant, and equipment   98,000  
Gain (loss) on sale of property plant and equipment   $ 0