Significant Customers	12 Months Ended
Jun. 30, 2020
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 two domestic customers, accounted for approximately 38% of total sales in 2020. Sales to three domestic customers accounted for 54% of total sales in 2019. The related accounts receivable balance, as a percentage of the Company's total trade accounts receivable balance, was 54% represented by two customers at June 30, 2020 and 51% represented by two customers at June 30, 2019. Export sales in fiscal years 2020 and 2019 were approximately $2,077,000 and $2,638,000, respectively.

Significant Customers

12 Months Ended

Jun. 30, 2020

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 two domestic customers, accounted for approximately 38% of total sales in 2020. Sales to three domestic customers accounted for 54% of total sales in 2019. The related accounts receivable balance, as a percentage of the Company's total trade accounts receivable balance, was 54% represented by two customers at June 30, 2020 and 51% represented by two customers at June 30, 2019.

Export sales in fiscal years 2020 and 2019 were approximately $2,077,000 and $2,638,000, respectively.