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Supplemental disclosure of cash flow information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Supplemental Disclosure Of Cash Flow Information [Line Items] |  |
Interest paid in cash | $ 12,534 | $ 5,978
Non-cash transactions: |  |
Transfers from inventory to property, plant and equipment and construction in progress | 400,004 | 291,275
Transfers from construction in progress to property, plant and equipment | 14,398,624 | 3,183,122
Transfers from other assets to construction in progress | 2,137,341 | 0
Transfer from other assets to land and rights of way held for development | 0 | 947,251
Issuance of 58,228 and 34,991, respectively, shares of common stock for services rendered | 674,658 | 402,927
Issuance of 7,409 and 9,441, respectively, shares of redeemable preferred stock for services rendered | 96,317 | 118,485
Conversion (on a one-to-one basis) of 5,809 and 12,214, respectively, shares of redeemable preferred stock to common stock | 3,485 | 7,328
Dividends declared but not paid | $ 1,276,505 | $ 1,270,950

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