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Property, plant and equipment and construction in progress | 12 Months Ended
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Dec. 31, 2013
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure [Text Block] | 7. Property, plant and equipment and construction in progress
|  | December 31, |
|  | 2013 |  | 2012 |
Land |  | $ | 3,223,361 |  | $ | 3,223,361 |
Buildings |  |  | 18,054,305 |  |  | 17,751,797 |
Plant and equipment |  |  | 60,416,031 |  |  | 57,635,523 |
Distribution system |  |  | 24,974,214 |  |  | 24,213,390 |
Office furniture, fixtures and equipment |  |  | 2,825,009 |  |  | 2,644,900 |
Vehicles |  |  | 1,237,736 |  |  | 1,182,782 |
Leasehold improvements |  |  | 235,930 |  |  | 228,007 |
Lab equipment |  |  | 29,871 |  |  | 19,192 |
|  |  | 110,996,457 |  |  | 106,898,952 |
Less accumulated depreciation |  |  | 52,393,571 |  |  | 47,905,546 |
Property, plant and equipment, net |  | $ | 58,602,886 |  | $ | 58,993,406 |
Construction in progress |  | $ | 1,450,417 |  | $ | 2,612,800 |
As of December 31, 2013, the Company had outstanding capital commitments of approximately $309,000. The Company maintains insurance for loss or damage to all fixed assets that it deems susceptible to loss. The Company does not insure its underground distribution system as the Company considers the possibility of material loss or damage to this system to be remote. During the years ended December 31, 2013 and 2012, $4,924,980 and $278,214, respectively, of construction in progress was placed in service. Depreciation expense was $5,113,589, $7,381,759, and $5,789,401 for the years ended December 31, 2013, 2012 and 2011, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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