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Supplemental disclosure of cash flow information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Disclosure Of Cash Flow Information [Line Items]      
Interest paid in cash $ 147,546 $ 196,768 $ 380,014
Non-cash transactions:      
Transfers from inventory to property plant and equipment and construction in progress 123,036 168,622 181,875
Transfers from construction in progress to property, plant and equipment 2,694,733 2,693,622 4,924,980
Issuance of 10,514, 18,294, and 25,111, respectively, shares of common stock for services rendered 119,018 263,098 217,826
Issuance of 8,615, 5,957, and 10,180 , respectively, shares of redeemable preferred stock for services rendered for services rendered 110,703 65,289 110,249
Conversion (on a one-to-one basis) of 7,195, 4,756, and 4,720, respectively, shares of redeemable preferred stock to common stock 4,317 2,854 2,832
Dividends declared but not paid 1,111,501 1,106,456 1,104,271
Obligation incurred for land held for development $ 0 $ 0 $ 10,050,000