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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Net cash provided by operating activities | $ 5,388,005 | $ 13,529,071
Cash flows from investing activities |  |
Additions to property, plant and equipment and construction in progress | (13,709,598) | (3,016,713)
Proceeds from sale of equipment | 51,590 | 18,827
Collections on loans receivable | 1,041,787 | 1,297,419
Payment for land and rights of way held for development | (2,168,180) | (665,270)
Net cash used in investing activities | (14,784,401) | (2,365,737)
Cash flows from financing activities |  |
Dividends paid to common shareholders | (3,818,499) | (3,346,477)
Dividends paid to non-controlling interests | 0 | 0
Dividends paid to preferred shareholders | (2,846) | (8,665)
Issuance (repurchase) of redeemable preferred stock | 10,258 | 12,456
Proceeds received from exercise of stock options | 0 | 0
Repayment of note payable to related party | (392,000) | (490,000)
Issuance of note payable to related party | 784,000 | 392,000
Net cash used in financing activities | (3,419,087) | (3,440,686)
Net increase (decrease) in cash and cash equivalents | (12,815,483) | 7,722,648
Cash and cash equivalents at beginning of period | 47,182,966 | 39,254,116
Cash and cash equivalents at end of period | 34,367,483 | 46,976,764
Interest paid in cash | 6,539 | 7,062
Non-cash investing and financing activities |  |
Conversion (on a one-to-one basis) of 5,426 and 12,214, respectively, shares of redeemable preferred stock to common stock | 3,256 | 7,328
Dividends declared but not paid | 1,275,066 | 1,120,176
Transfers from inventory to property, plant and equipment and construction in progress | 304,279 | 228,549
Transfers from construction in progress to property, plant and equipment | 492,252 | 2,109,960
Transfers from other assets to construction in progress | 1,253,299 | 0
Common Stock [Member] |  |
Non-cash investing and financing activities |  |
Stock Issued | 441,161 | 203,551
Preferred Stock [Member] |  |
Non-cash investing and financing activities |  |
Stock Issued | $ 96,317 | $ 118,485

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