Accrued expense (Notes)

12 Months Ended

Jun. 30, 2020

Payables and Accruals [Abstract]

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

	June 30,
	2020		2019
Accrued compensation	$	417,829	$	396,609
Line of credit and notes payable interest accrual	1,224		1,013
Customer deposits	14,320		16,006
Warranty reserve	32,078		32,078
Sales tax payable	100,176		100,582
Rent payable	—		70,587
Other accruals	115,420		39,832
Total accrued expenses	$	681,047	$	656,707

Accrued compensation as of June 30, 2020 and 2019 primarily relates to payroll, vacation accruals, and payroll tax liabilities.

Schedule of Accrued Liabilities [Table Text Block]

	June 30,
	2020		2019
Accrued compensation	$	417,829	$	396,609
Line of credit and notes payable interest accrual	1,224		1,013
Customer deposits	14,320		16,006
Warranty reserve	32,078		32,078
Sales tax payable	100,176		100,582
Rent payable	—		70,587
Other accruals	115,420		39,832
Total accrued expenses	$	681,047	$	656,707