Supplemental disclosure of cash flow information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplemental disclosure of cash flow information
Interest paid in cash	$ 8,479	$ 21,417	$ 14,797
Income taxes paid in cash	3,147,300	4,920,912	211,000
Non-cash transactions:
Issuance of 0, 368,383 and 0, respectively, shares of common stock for the purchase of non-controlling interest in PERC	0	5,359,973
Transfers from inventory to property, plant and equipment and construction in progress	538,777	317,853	346,024
Transfers from construction in progress to property, plant and equipment	1,395,485	7,093,158	297,723
Right-of-use assets obtained in exchange for new operating lease liabilities	1,604,702	745,078
Purchase of equipment through issuance of long-term debt	0	0	188,645
Transfers from prepaid expenses to property, plant and equipment	67,136	271,922
Redeemable preferred stock
Non-cash transactions:
Issuance of 5,904, 13,309 and 9,295, respectively, shares of redeemable preferred stock for services rendered	148,485	323,275	133,197
Conversion (on a one-to-one basis) of 5,968, 8,848 and 6,585, respectively, shares of redeemable preferred stock to common stock	3,581	5,309	3,951
Dividends declared but not paid	1,747,938	1,502,506	1,305,367
Common stock
Non-cash transactions:
Issuance of 68,832, 68,864 and 72,597, respectively, shares of common stock for services rendered	$ 1,064,119	$ 1,015,177	$ 877,298