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v3.21.2

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Net cash provided by operating activities - continuing operations | $ 5,285,457 | $ 11,909,538
Net cash used in operating activities - discontinued operations | (820,785) | (1,390,227)
Net cash provided by operating activities | 4,464,672 | 10,519,311
Cash flows from investing activities |  |
Purchase of certificate of deposit | (2,500,000) |
Additions to property, plant and equipment and construction in progress | (973,270) | (1,571,450)
Proceeds from asset dispositions | 45,560 | 450
Purchase of non-controlling interest in PERC |  | (900,000)
Net cash used in investing activities | (3,427,710) | (10,971,000)
Cash flows from financing activities |  |
Dividends paid to common shareholders | (3,859,412) | (3,849,075)
Dividends paid to preferred shareholders | (8,387) | (9,180)
Dividends paid to non-controlling interests | (649,880) |
Repurchase of redeemable preferred stock | (14,863) | (1,144)
Proceeds received from exercise of stock options | 17,059 | 10,161
Principal repayments on long-term debt | (35,840) | (22,874)
Net cash used in financing activities | (4,551,323) | (3,872,112)
Net decrease in cash and cash equivalents | (3,514,361) | (4,323,801)
Cash and cash equivalents at beginning of period | 43,794,150 | 42,071,083
Cash and cash equivalents at beginning of period - discontinued operations | 154,130 | 831,586
Less: cash and cash equivalents at end of period - discontinued operations | (36,326) | (399,454)
Cash and cash equivalents at end of period | 40,397,593 | 38,179,414
Interest paid in cash | 7,714 | 7,413
Non-cash transactions: |  |
Dividends declared but not paid | 1,295,538 | 1,288,185
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress | 191,434 | 12,649
Transfers from construction in progress to property, plant and equipment | 375,906 | 1,494,692
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 | 58,220 | 122,292
Aerex |  |
Cash flows from investing activities |  |
Acquisition of noncontrolling interest in subsidiaries | $ 0 | $ (8,500,000)

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