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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Net cash provided by operating activities - continuing operations | $ 5,671,510 | $ 4,876,817
Net cash used in operating activities - discontinued operations | (324,965) | (254,763)
Net cash provided by operating activities | 5,346,545 | 4,622,054
Cash flows from investing activities |  |
Purchase of certificate of deposit |  | (2,518,493)
Maturity of certificate(s) of deposit |  | 2,500,000
Additions to property, plant and equipment and construction in progress | (1,381,796) | (727,925)
Proceeds from asset dispositions | 15,944 | 11,043
Purchase of non-controlling interest in PERC | (2,440,027) |
Net cash used in investing activities | (3,805,879) | (735,375)
Cash flows from financing activities |  |
Dividends paid to common shareholders | (1,303,974) | (1,296,957)
Dividends paid to preferred shareholders | (2,922) | (2,434)
Principal repayments on long-term debt | (27,218) | (14,605)
Net cash used in financing activities | (1,334,114) | (1,313,996)
Net increase (decrease) in cash and cash equivalents | 206,552 | 2,572,683
Cash and cash equivalents at beginning of period | 50,711,751 | 40,358,059
Cash and cash equivalents at beginning of period - discontinued operations | 442,252 | 750,048
Less: cash and cash equivalents at end of period - discontinued operations | (256,287) | (536,249)
Cash and cash equivalents at end of period | 51,104,268 | 43,144,541
Non-cash transactions: |  |
Dividends declared but not paid | 1,342,695 | 1,301,704
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress | 61,665 | 97,284
Transfers from construction in progress to property, plant and equipment | 133,664 | 167,065
Transfers from prepaids to property, plant and equipment | 91,123 |
Transfers from prepaids to inventory | 238,032 |
Common stock [Member] |  |
Non-cash transactions: |  |
Issuance of 44,873 and 41,830, respectively, shares of common stock for services rendered | 621,811 | $ 521,016
Issuance of 368,383 and 0, respectively, shares of common stock for the purchase of non-controlling interests in PERC | $ 5,359,973 |

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