Supplemental disclosure of cash flow information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Supplemental disclosure of cash flow information
Interest paid in cash	$ 10,248	$ 9,669
Non-cash transactions:
Dividends declared but not paid	1,298,148	1,289,854
Transfers from inventory to property, plant and equipment and construction in progress	189,924	73,464
Transfers from construction in progress to property, plant and equipment	644,224	1,653,501
Right-of-use assets obtained in exchange for new operating lease liabilities	1,852,608	299,992
Purchase of equipment through issuance of long-term debt	$ 95,707	$ 122,292