Note 15 - New Accounting Pronouncements (Tables)

6 Months Ended

Sep. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

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

	For the Three Months Ended September 30, 2018
	Commercial		Government
Sales Distribution
Test Units	$	261,992	$	1,284,099
Repairs and Calibration		586,577		-
Replacement Parts		79,586		-
Extended Warranty		10,687		-
	$	938,842	$	1,284,099

	For the Six Months Ended September 30, 2018
	Commercial		Government
Sales Distribution
Test Units	$	596,224	$	2,376,681
Repairs and Calibration		919,276		-
Replacement Parts		125,354		-
Extended Warranty		19,620		-
	$	1,660,474	$	2,376,681