Significant Customers	12 Months Ended
Jun. 30, 2021
Significant Customers [Abstract]
Significant Customers	Note 9. Significant Customers A significant portion of the Company's business is the production of military and industrial electronic equipment for use by the U.S. and foreign governments and certain industrial customers. Sales to four domestic customers accounted for 59% of total sales in 2021. Sales to two domestic customers accounted for 38% of total sales in 2020. The related accounts receivable balance, as a percentage of the Company's total trade accounts receivable balance, was 76% represented by four customers at June 30, 2021 and 54% represented by two customers at June 30, 2020. Export sales in fiscal years 2021 and 2020 were approximately $2,019,000 and $2,077,000, respectively.

Significant Customers

12 Months Ended

Jun. 30, 2021

Note 9. Significant Customers

A significant portion of the Company's business is the production of military and industrial electronic equipment for use by the U.S. and foreign governments and certain industrial customers. Sales to four domestic customers accounted for 59% of total sales in 2021. Sales to two domestic customers accounted for 38% of total sales in 2020. The related accounts receivable balance, as a percentage of the Company's total trade accounts receivable balance, was 76% represented by four customers at June 30, 2021 and 54% represented by two customers at June 30, 2020.

Export sales in fiscal years 2021 and 2020 were approximately $2,019,000 and $2,077,000, respectively.