Note 3 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Disaggregation of Revenue [Table Text Block]

In the following tables, revenue is disaggregated by revenue category.

	For the Three Months Ended September 30, 2019
	Commercial		Government
Sales Distribution
Test Units	$	182,987	$	3,140,454
	$	182,987	$	3,140,454

	For the Three Months Ended September 30, 2018
	Commercial		Government
Sales Distribution
Test Units	$	280,056	$	1,284,099
	$	280,056	$	1,284,099

	For the Six Months Ended September 30, 2019
	Commercial		Government
Sales Distribution
Test Units	$	478,910	$	5,644,594
	$	478,910	$	5,644,594

	For the Six Months Ended September 30, 2018
	Commercial		Government
Sales Distribution
Test Units	$	612,431	$	2,376,681
	$	612,431	$	2,376,681

Revenue from External Customers by Geographic Areas [Table Text Block]

In the following table, revenue is disaggregated by geography.

	For the Three Months Ended September 30, 2019		For the Three Months Ended September 30, 2018
Geography
United States	$	2,420,423	$	1,879,079
International		1,491,745		343,862
Total	$	3,912,168	$	2,222,941

	For the Six Months Ended September 30, 2019		For the Six Months Ended September 30, 2018
Geography
United States	$	5,332,890	$	3,261,767
International		1,885,740		775,388
Total	$	7,218,630	$	4,037,155