Property, Plant and Equipment (Summary of Original Cost of Property, Plant and Equipment) (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018
Property, plant and equipment, gross	$ 15,962,555	$ 15,471,541
Accumulated depreciation	(12,137,144)	(11,712,904)
Property, plant and equipment, net	3,825,411	3,758,637
Land [Member]
Property, plant and equipment, gross	45,000	45,000
Buildings and improvements [Member]
Property, plant and equipment, gross	4,591,429	4,378,866
Machinery and equipment [Member]
Property, plant and equipment, gross	11,156,006	10,877,555
Furniture and fixtures [Member]
Property, plant and equipment, gross	$ 170,120	$ 170,120

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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