Property, plant and equipment and construction in progress (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

	December 31,
	2012		2011
Land	$	3,223,361	$	3,223,361
Buildings		17,751,797		16,732,298
Plant and equipment		57,635,523		58,758,920
Distribution system		24,213,390		24,099,566
Office furniture, fixtures and equipment		2,644,900		2,492,913
Vehicles		1,182,782		1,283,037
Leasehold improvements		228,007		222,829
Lab equipment		19,192		34,874
		106,898,952		106,847,798
Less accumulated depreciation		47,905,546		42,662,688
Property, plant and equipment, net	$	58,993,406	$	64,185,110
Construction in progress	$	2,612,800	$	141,204