Note 7. Line of credit (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017	Dec. 29, 2016
Line of Credit Facility [Line Items]
Line of credit outstanding	$ 165,000		$ 165,000		$ 250,000
Line of Credit Facility, Periodic Payment, Interest	16,339	$ 12,884	36,849	$ 12,884
Interest Expense	28,354	$ 33,049	96,364	$ 65,851
Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 250,000		$ 250,000			$ 250,000
Maximum borrowing capacity (as a percentage of inventory	50.00%		50.00%
Current annual interest rate (as a percent)			9.25%
Fiscal period used to compute interest			360 days
Collateral monitoring fee (as a percent)			8.50%	0.70%
Collateral monitoring fee in event of default (as a percent)				1.00%
Line of credit outstanding	$ 165,000		$ 165,000		$ 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)			4.25%
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%