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Supplemental disclosure of cash flow information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Supplemental disclosure of cash flow information    
Interest paid in cash $ 2,814 $ 12,534
Non-cash transactions:    
Dividends declared but not paid 1,282,086 1,276,505
Transfers from inventory to property, plant and equipment and construction in progress 443,018 400,004
Transfers from construction in progress to property, plant and equipment 7,755,375 14,398,624
Transfers from other assets to construction in progress 0 2,137,341
Right-of-use assets obtained in exchange for new operating lease liabilities $ 5,148,138 $ 0