Line of credit (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 29, 2016	Jun. 30, 2016
Line of Credit Facility [Line Items]
Line of credit outstanding	$ 250,000		$ 250,000			$ 0
Line of Credit Facility, Periodic Payment, Interest	12,884		18,884
Interest Expense	33,049	$ 3,103	$ 65,851	$ 3,103
Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 250,000
Maximum borrowing capacity (as a percentage of inventory					50.00%
Current annual interest rate (as a percent)			9.00%
Fiscal period used to compute interest			360 days
Closing fee (as a percent)			1.00%
Renewal fee (as a percent)			1.00%
Collateral monitoring fee (as a percent)			0.70%
Collateral monitoring fee in event of default (as a percent)			1.00%
Line of credit outstanding	$ 250,000		$ 250,000
Prime Rate [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)			5.00%
Variable rate basis (as a percent)			4.00%
Basis spread on variable rate if delinquent (as a percent)			10.00%
Minimum [Member] | Prime Rate [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Current annual interest rate (as a percent)			5.00%