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Property, plant and equipment and construction in progress (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
 
 
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