Line of credit (Notes)	12 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	On June 29, 2018 the Company entered a business loan agreement with TD bank receiving a line of credit evidenced by a promissory note of $250,000. The interest is subject to change based on changes in an independent index which the Wall Street Journal Prime. The index rate at the date of the agreement is 5.000% per annum. Interest on the unpaid principal balance of the note is calculated using a rate of 0.740 percentage points over the index, adjusted if necessary for any minimum and maximum rate limitations, resulting in an initial rate of 5.740% per annum based on a year of 360 days. The interest rate was 5% as of June 30, 2021. The Company was required to put $250,000 in the TD bank savings account as collateral. Mr. Richard J. DePiano Sr. executed a guarantee of the loan in favor of TD Bank. Mr. DePiano Sr. passed away on October 3, 2019, therefore the guarantee is now assumed by his estate. As of June 30, 2021 and 2010, the line of credit balance was $201,575 with TD bank. The line of credit interest expense was approximately $10,000 and $11,000 for the years ended June 30, 2021 and 2020, respectively.

Line of credit (Notes)

12 Months Ended

Jun. 30, 2021

On June 29, 2018 the Company entered a business loan agreement with TD bank receiving a line of credit evidenced by a promissory note of $250,000. The interest is subject to change based on changes in an independent index which the Wall Street Journal Prime. The index rate at the date of the agreement is 5.000% per annum. Interest on the unpaid principal balance of the note is calculated using a rate of 0.740 percentage points over the index, adjusted if necessary for any minimum and maximum rate limitations, resulting in an initial rate of 5.740% per annum based on a year of 360 days. The interest rate was 5% as of June 30, 2021. The Company was required to put $250,000 in the TD bank savings account as collateral. Mr. Richard J. DePiano Sr. executed a guarantee of the loan in favor of TD Bank. Mr. DePiano Sr. passed away on October 3, 2019, therefore the guarantee is now assumed by his estate. As of June 30, 2021 and 2010, the line of credit balance was $201,575 with TD bank. The line of credit interest expense was approximately $10,000 and $11,000 for the years ended June 30, 2021 and 2020, respectively.