Note 3 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jun. 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 June 30, 2019
	Commercial		Government
Sales Distribution
Test Units	$	295,923	$	2,504,140
	$	295,923	$	2,504,140

	For the Three Months Ended June 30, 2018
	Commercial		Government
Sales Distribution
Test Units	$	332,375	$	1,092,582
	$	332,375	$	1,092,582

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

In the following table, revenue is disaggregated by geography.

	For the Three Months Ended June 30, 2019		For the Three Months Ended June 30, 2018
Geography
United States	$	2,912,737	$	1,382,688
International		393,725		431,526
Total	$	3,306,462	$	1,814,214