Line of credit (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 29, 2018	Dec. 29, 2016
Line of Credit Facility [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	$ 165,000	$ 165,000
Line of Credit Facility, Periodic Payment, Interest		37,000	$ 33,000
Repayments of Lines of Credit		201,574
Interest paid		37,811	54,802
Accrued expenses	874,421	874,421	$ 577,329
Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 250,000
Line of Credit Facility, Current Borrowing Capacity	$ 250,000	$ 250,000
Line of Credit Facility, Maximum Borrowing Capacity, as a Percentage of Inventory	50.00%	50.00%
Debt Instrument, Closing Fee, Percent		1.00%
Line of Credit Facility, Renewal Fee, Percent		1.00%
Line of Credit Facility, Collateral Monitoring Fee, Percent	0.70%	8.50%
Line of Credit Facility, Collateral Monitoring Fee in Event of Default, Percent		1.00%
Repayments of Lines of Credit		$ 165,000
Interest paid		2,579
General and Administrative Expense		1,000
Line Of Credit Facility, Prime Plus Fee		1,895
Accrued expenses	$ 28,797	$ 28,797
Prime Rate [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Delinquent Payments, Basis Spread on Variable Rate		5.00%
Minimum [Member] | Prime Rate [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate During Period		5.00%
Notes Payable to Banks [Member]
Line of Credit Facility [Line Items]
Notes Payable to Bank				$ 250,000
Debt Instrument, Interest Rate, Stated Percentage				5.00%
Debt Instrument, Basis Spread on Variable Rate		74.00%
Debt Instrument, Interest Rate During Period		5.74%
Line of Credit Facility, Collateral Fees, Amount		$ 250,000