Note 11 - Segment Information (Tables)

12 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Chemical			Electronics			Engineering		Total
Twelve months ended March 31, 2021
Revenue from external customers	$	1,244,361		$	1,328,719		$	517,551	$	3,090,631
Segment operating income (loss)	$	(263,061	)	$	(457,372	)	$	39,955	$	(680,478	)
Twelve months ended March 31, 2020
Revenue from external customers	$	1,368,365		$	1,400,918		$	716,709	$	3,485,992
Segment operating income (loss)	$	58,477		$	(147,023	)	$	45,157	$	(43,389	)
Total assets at March 31, 2021	$	2,033,499		$	2,294,203		$	886,397	$	5,214,099
Total assets at March 31, 2020	$	2,021,235		$	1,970,705		$	1,061,149	$	5,053,089