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Supplemental disclosure of cash flow information (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Disclosure Of Cash Flow Information [Line Items]      
Interest paid in cash, net of capitalized interest of $246,851 in 2011 $ 380,014 $ 670,042 $ 962,744
Non-cash transactions:      
Transfers from (to) inventory to (from) property plant and equipment, net 181,875 508,107 (100,000)
Issuance of 25,111, 21,686 and 11,158, respectively, of common stock for services rendered 217,826 175,313 104,443
Issuance of 10,180, 10,033 and 7,455, respectively, of redeemable preferred stock for services rendered 110,249 77,856 65,902
Conversion (on a one-to-one basis) of 4,720, 2,629 and 2,145,respectively, of redeemable preferred stock to common stock 2,832 1,577 1,287
Dividends declared but not paid 1,104,271 1,096,746 1,094,334
Obligation incurred for investment in land $ 10,050,000 $ 0 $ 0