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Property, plant and equipment and construction in progress (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 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
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,223,361 3,223,361
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 18,054,305 17,751,797
Plant and equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 60,416,031 57,635,523
Distribution system [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 24,974,214 24,213,390
Office furniture, fixtures and equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,825,009 2,644,900
Vehicles [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,237,736 1,182,782
Leasehold improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 235,930 228,007
Lab equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 29,871 $ 19,192