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Property, plant and equipment and construction in progress (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
 
 
December 31,
 
 
 
2014
 
2013
 
Land
 
$
3,223,361
 
$
3,223,361
 
Buildings
 
 
18,462,770
 
 
18,422,087
 
Plant and equipment
 
 
61,679,293
 
 
60,552,890
 
Distribution system
 
 
31,481,048
 
 
30,719,858
 
Office furniture, fixtures and equipment
 
 
3,159,699
 
 
3,010,080
 
Vehicles
 
 
1,273,803
 
 
1,251,653
 
Leasehold improvements
 
 
260,519
 
 
235,930
 
Lab equipment
 
 
28,743
 
 
28,942
 
 
 
 
119,569,236
 
 
117,444,801
 
Less accumulated depreciation
 
 
63,172,248
 
 
58,841,915
 
Property, plant and equipment, net
 
$
56,396,988
 
$
58,602,886
 
Construction in progress
 
$
1,900,016
 
$
1,450,417