Note 11 - Disaggregated Net Revenues and Segment Information (Tables)

12 Months Ended

Mar. 31, 2019

Notes Tables

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

	Twelve Months Ended March 31,
	2019		2018
Net Revenue in the US
Chemical	$	954,396	$	1,075,107
Electronics		730,634		1,031,384
Engineering		969,506		1,306,306
	$	2,654,536	$	3,412,797
Net Revenue outside the US
Chemical		364,418		316,415
Electronics		-		25,000
Engineering		-		-
	$	364,418	$	341,415
Total Net Revenues	$	3,018,954	$	3,754,212