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Property, Plant and Equipment (Tables)
12 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Summary of the original cost of property, plant and equipment

Property, plant and equipment at June 30, 2018 and 2017 is as follows:

   2018   2017 
Land  $45,000   $45,000 
Building and improvements   4,378,866    4,304,366 
Machinery and equipment   10,877,555    9,028,835 
Furniture and fixtures   170,120    170,120 
    15,471,541    13,548,321 
Accumulated depreciation   (11,712,904)   (11,283,225)
Property, plant and equipment, net  $3,758,637   $2,265,096