(11) Income Taxes (Details 2) - USD ($)	Jun. 30, 2018	Jun. 30, 2017
Text Block [Abstract]
Inventory capitalization for income tax purposes	$ 60,944	$ 92,681
Inventory reserve	119,181	157,068
Accrued employee benefit reserve	93,496	0
Warranty reserve	53,522	78,780
Accrued product liability and other	7,949	9,103
Allowance for doubtful accounts	95,522	149,110
Property and equipment, principally due to differences in depreciation	(155,096)	(103,308)
Research and development credit carryover	588,707	351,903
Other intangibles	(98,067)	(45,256)
Deferred gain on sale lease-back	548,026	846,061
Operating loss carry forwards	1,317,887	1,428,119
Valuation allowance	(2,632,071)	(2,964,261)
Total deferred income tax assets (liabilities)	$ 0	$ 0