Accrued expense (Tables)

12 Months Ended

Jun. 30, 2019

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

	June 30, 2019		June 30, 2018
Accrued compensation	$	396,609	$	424,871
Line of credit interest accrual	1,013		29,797
Customer deposits	16,006		61,494
Warranty reserve	32,078		32,078
Sales tax payable	100,582		104,539
Rent payable	70,587		49,458
Other accruals	39,832		59,795
Total accrued expenses	$	656,707	$	762,032