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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) |  |
Net cash provided by (used in) operating activities | $ (288,649) | $ 3,693,963
Cash flows from investing activities |  |
Additions to property, plant and equipment and construction in progress | (516,331) | (1,336,022)
Proceeds from asset dispositions | 450 | 46,700
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 | 364,515
Net cash provided by (used in) investing activities | (9,015,881) | 5,781,427
Cash flows from financing activities |  |
Dividends paid to common shareholders | (1,280,993) | (1,275,151)
Dividends paid to preferred shareholders | (2,869) | (2,958)
Repurchase of redeemable preferred stock | 0 | (17,795)
Principal repayments of long-term debt | (3,496) | 0
Net cash used in financing activities | (1,287,358) | (1,295,904)
Net increase (decrease) in cash and cash equivalents | (10,591,888) | 8,179,486
Cash and cash equivalents at beginning of period | 42,902,669 | 31,337,477
Cash and cash equivalents at end of period | 32,310,781 | 39,516,963
Cash and cash equivalents at end of period | 32,310,781 | 38,016,963
Restricted cash at end of period | 0 | 1,500,000
Cash and cash equivalents and restricted cash at end of period | 32,310,781 | 39,516,963
Interest paid in cash | 2,526 | 0
Non-cash transactions: |  |
Dividends declared but not paid | 1,290,058 | 1,280,903
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress | (71,719) | 131,439
Transfers from construction in progress to property, plant and equipment | 1,336,271 | 6,769,561
Right-of-use assets obtained in exchange for new operating lease liabilities | $ 78,003 | $ 3,464,670

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