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Property, plant and equipment (Tables)
6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Major classifications of property, plant and equipment
Major classifications of property, plant and equipment are summarized as follows:
 
 
June 30,
 
December 31,
 
 
2018
 
2017
Land
 
$
714,785

 
$
676,083

Building and improvements
 
9,316,101

 
9,187,160

Construction in process
 
5,562,148

 
5,119,961

Equipment
 
9,558,732

 
8,211,510

Office furniture and equipment
 
190,998

 
136,091

Vehicles
 
27,830

 
29,135

Total property and equipment
 
$
25,370,594

 
$
23,359,940

Less accumulated depreciation and amortization
 
(1,752,893
)
 
(1,556,964
)
Property, plant and equipment, net
 
$
23,617,701

 
$
21,802,976