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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Net cash provided by operating activities - continuing operations | $ 11,909,538 | $ 12,039,106
Net cash provided by operating activities - discontinued operations | (1,390,227) | (1,511,952)
Net cash provided by operating activities | 10,519,311 | 10,527,154
Cash flows from investing activities |  |
Additions to property, plant and equipment and construction in progress | (1,571,450) | (2,673,192)
Proceeds from asset dispositions | 450 | 548,480
Proceeds from sale of discontinued operations, net of cash provided | 0 | 6,971,234
Collections on loans receivable | 0 | 734,980
Net cash provided by (used in) investing activities | (10,971,000) | 5,581,502
Cash flows from financing activities |  |
Dividends paid to common shareholders | (3,849,075) | (3,827,160)
Dividends paid to preferred shareholders | (9,180) | (9,157)
Repurchase of redeemable preferred stock | (1,144) | (24,096)
Principal repayments on long-term debt | (22,874) | 0
Proceeds received from exercise of stock options | 10,161 | 15,822
Net cash used in financing activities | (3,872,112) | (3,844,591)
Net increase (decrease) in cash and cash equivalents | (4,323,801) | 12,264,065
Cash and cash equivalents at beginning of period | 42,071,083 | 31,111,968
Cash and cash equivalents at beginning of period - discontinued operations | 831,586 | 225,509
Less: cash and cash equivalents at end of period - discontinued operations | (399,454) | (1,361,514)
Cash and cash equivalents at end of period | 38,179,414 | 42,240,028
Cash and cash equivalents at end of period | 38,179,414 | 40,629,557
Restricted cash at end of period | 0 | 1,610,471
Cash and cash equivalents and restricted cash at end of period | 38,179,414 | 42,240,028
Interest paid in cash | 7,413 | 19
Non-cash transactions: |  |
Dividends declared but not paid | 1,288,185 | 1,280,213
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress | 12,649 | 342,619
Transfers from construction in progress to property, plant and equipment | 1,494,692 | 7,408,954
Right-of-use assets obtained in exchange for new operating lease liabilities | 299,992 | 2,132,069
Purchase of equipment through issuance of long-term debt | 122,292 |
Aerex |  |
Cash flows from investing activities |  |
Acquisition of noncontrolling interest in subsidiaries | (8,500,000) | $ 0
PERC Water Corporation |  |
Cash flows from investing activities |  |
Acquisition of noncontrolling interest in subsidiaries | $ (900,000) |

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