Income Taxes (Components of Net Deferred Income Tax Assets and Liabilities) (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 7,102,298	$ 7,042,134
Deferred income tax liabilities:
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	166,317	178,788
Deferred Tax Assets, Tax Credit Carryforwards, General Business	207,698	207,698
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	23,207	24,975
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	40,565	46,527
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	102,002	96,813
Deferred Tax Assets, Property, Plant and Equipment	127,642	119,980
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	6,736	6,736
Deferred Tax Assets, Gross	7,776,465	7,723,651
Deferred Tax Assets, Valuation Allowance	(7,619,657)	(7,562,716)
Deferred Tax Assets, Net of Valuation Allowance	156,808	160,935
Deferred Tax Liabilities, Property, Plant and Equipment	(156,808)	(160,935)
Deferred Tax Liabilities, Gross	(156,808)	(160,935)
Deferred Tax Assets, Net	$ 0	$ 0