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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) |  |
Net cash provided by operating activities | $ 3,843,490 | $ 8,552,481
Cash flows from investing activities |  |
Additions to property, plant and equipment and construction in progress | (710,823) | (1,816,397)
Proceeds from asset dispositions | 450 | 443,500
Proceeds from sale of discontinued operations, net of cash provided | 0 | 6,706,234
Acquisition of noncontrolling interest in Aerex | (8,500,000) | 0
Collections on loans receivable | 0 | 734,980
Net cash provided by (used in) investing activities | (9,210,373) | 6,068,317
Cash flows from financing activities |  |
Dividends paid to common shareholders | (2,564,980) | (2,551,153)
Dividends paid to preferred shareholders | (5,738) | (5,747)
Repurchase of redeemable preferred stock | 0 | (24,096)
Principal repayments on long-term debt | (13,158) | 0
Proceeds received from exercise of stock options | 4,418 | 7,123
Net cash used in financing activities | (2,579,458) | (2,573,873)
Net increase (decrease) in cash and cash equivalents | (7,946,341) | 12,046,925
Cash and cash equivalents at beginning of period | 42,902,669 | 31,337,477
Cash and cash equivalents at end of period | 34,956,328 | 43,384,402
Cash and cash equivalents at end of period | 34,956,328 | 41,878,723
Restricted cash at end of period | 0 | 1,505,679
Cash and cash equivalents and restricted cash at end of period | 34,956,328 | 43,384,402
Interest paid in cash | 5,344 | 1,482
Non-cash transactions: |  |
Dividends declared but not paid | 1,288,154 | 1,280,139
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress | (49,133) | 223,136
Transfers from construction in progress to property, plant and equipment | 1,400,811 | 6,916,301
Right-of-use assets obtained in exchange for new operating lease liabilities | 78,003 | $ 4,850,902
Purchase of equipment through issuance of long-term debt | $ 122,292 |

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