Property, Plant and Equipment (Summary of Original Cost of Property, Plant and Equipment) (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2016
Property, plant and equipment, gross	$ 13,548,321	$ 13,199,649
Accumulated depreciation	(11,283,225)	(10,851,124)
Property, plant and equipment, net	2,265,096	2,348,525
Land [Member]
Property, plant and equipment, gross	45,000	45,000
Buildings and improvements [Member]
Property, plant and equipment, gross	4,304,366	4,259,266
Machinery and equipment [Member]
Property, plant and equipment, gross	9,028,835	8,735,432
Furniture and fixtures [Member]
Property, plant and equipment, gross	$ 170,120	$ 159,951