Income Taxes (Components of Net Deferred Income Tax Assets and Liabilities) (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 7,212,393	$ 7,102,298
Deferred income tax liabilities:
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	0	166,317
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	25,728	23,207
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	43,741	40,565
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	69,432	102,002
Deferred Tax Assets, Property, Plant and Equipment	69,196	127,642
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	6,736	6,736
Deferred Tax Assets, Gross	7,634,924	7,776,465
Deferred Tax Assets, Valuation Allowance	(7,609,293)	(7,619,657)
Deferred Tax Assets, Net of Valuation Allowance	25,631	156,808
Deferred Tax Liabilities, Property, Plant and Equipment	(25,631)	(156,808)
Deferred Tax Liabilities, Gross	(25,631)	(156,808)
Deferred Tax Assets, Net	0	0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (10,364)	$ (56,940)