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Supplemental disclosure of cash flow information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Supplemental disclosure of cash flow information |  |
Interest paid in cash | $ 9,669 | $ 1,332
Non-cash transactions: |  |
Dividends declared but not paid | 1,289,854 | 1,282,086
Transfers from inventory to property, plant and equipment and construction in progress | 73,464 | 443,018
Transfers from construction in progress to property, plant and equipment | 1,653,501 | 7,755,375
Right-of-use assets obtained in exchange for new operating lease liabilities | 299,992 | 2,429,305
Purchase of equipment through issuance of long-term debt | $ 122,292 | $ 78,899

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