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

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

	December 31,
	2018		2017
Land	$	3,435,361	$	3,435,361
Buildings		19,829,575		19,916,098
Plant and equipment		61,777,836		58,873,604
Distribution system		36,057,078		33,901,161
Office furniture, fixtures and equipment		3,635,184		3,413,702
Vehicles		1,431,719		1,444,182
Leasehold improvements		244,221		237,027
Lab equipment		27,795		157,838
		126,438,769		121,378,973
Less accumulated depreciation		67,557,951		71,695,202
Property, plant and equipment, net	$	58,880,818	$	49,683,771
Construction in progress	$	6,015,043	$	1,823,284