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Supplemental disclosure of cash flow information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Supplemental Disclosure Of Cash Flow Information [Line Items] |  |  |
Interest paid in cash | $ 74,898 | $ 147,546 | $ 196,768
Non-cash transactions: |  |  |
Transfers from inventory to property plant and equipment and construction in progress | 276,807 | 123,036 | 168,622
Transfers from construction in progress to property, plant and equipment | 3,542,119 | 2,694,733 | 2,693,622
Issuance of 25,156, 10,514, and 18,294, respectively, shares of common stock for services rendered | 278,388 | 119.018 | 263,098
Issuance of 8,421, 8,615, and 5,957, respectively, shares of redeemable preferred stock for services rendered | 111,410 | 110,703 | 65,289
Conversion (on a one-to-one basis) of 11,558, 7,195, and 4,756, respectively, shares of redeemable preferred stock to common stock | 6,935 | 4,317 | 2,854
Dividends declared but not paid | $ 1,118,017 | $ 1,111,501 | $ 1,106,456

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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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