Income Taxes (Components of Net Deferred Income Tax Assets and Liabilities) (Details) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 7,352,719	$ 7,212,393
Deferred income tax liabilities:
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	0	0
Deferred Tax Assets, Tax Credit Carryforwards, General Business	0	207,698
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	21,100	25,728
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	49,336	43,741
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	69,432	69,432
Deferred Tax Assets, Property, Plant and Equipment	65,432	69,196
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	6,736	6,736
Deferred Tax Assets, Gross	7,564,755	7,634,924
Deferred Tax Assets, Valuation Allowance	(7,543,251)	(7,609,293)
Deferred Tax Assets, Net of Valuation Allowance	21,504	25,631
Deferred Tax Liabilities, Property, Plant and Equipment	(21,504)	(25,631)
Deferred Tax Liabilities, Gross	(21,504)	(25,631)
Deferred Tax Assets, Net	0	0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (66,042)	$ (10,364)