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Supplemental disclosure of cash flow information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Disclosure Of Cash Flow Information [Line Items]      
Interest paid in cash $ 7,062 $ 74,898 $ 147,546
Non-cash transactions:      
Transfers from inventory to property, plant and equipment and construction in progress 291,275 276,807 123,036
Transfers from construction in progress to property, plant and equipment 3,183,122 3,542,119 2,694,733
Issuance of 34,991, 25,156, and 10,514, respectively, shares of common stock for services rendered 402,927 278,388 119,018
Issuance of 9,441, 8,421, and 8,615, respectively, shares of redeemable preferred stock for services rendered 118,485 111,410 110,703
Conversion (on a one-to-one basis) of 12,214, 11,558, and 7,195, respectively, shares of redeemable preferred stock to common stock 7,328 6,935 4,317
Dividends declared but not paid $ 1,270,950 $ 1,118,017 $ 1,111,501