Income Taxes Schedule of deferred tax assets and liabilities (Tables)

12 Months Ended

Jun. 30, 2019

Schedule of Deferred Tax Assets and Liabilities [Abstract]

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	2019			2018
Deferred income tax assets:
Net operating loss carryforward	$	7,102,298		$	7,042,134
Executive post retirement costs	166,317			178,788
General business credit	207,698			207,698
Allowance for doubtful accounts	23,207			24,975
Accrued vacation	40,565			46,527
Inventory reserve	102,002			96,813
Accelerated depreciation	127,642			119,980
Warranty reserve	6,736			6,736
Total deferred income tax assets	7,776,465			7,723,651
Valuation allowance	(7,619,657		)	(7,562,716		)
	156,808			160,935
Deferred income tax liabilities:
Accelerated depreciation	(156,808		)	(160,935		)
Total deferred income tax liabilities	(156,808		)	(160,935		)
	$	—		$	—