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v3.25.1

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

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