Significant Customer Concentrations (Tables)

12 Months Ended

Mar. 31, 2021

Risks and Uncertainties [Abstract]

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

The following table presents net sales by U.S. and foreign countries:

	2021		2020
United States	$	5,511,516	$	7,205,596
Foreign countries		6,071,004		8,569,347
Total Avionics Sales	$	11,582,520	$	15,774,943