Note 10 - Segment Information (Tables)

12 Months Ended

Mar. 31, 2023

Notes Tables

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

	Chemical			Electronics			Engineering			Total
Twelve months ended March 31, 2023
Revenue from external customers	$	1,258,890		$	1,883,251		$	534,644		$	3,676,785
Segment operating income (loss)	$	(49,966	)	$	(65,271	)	$	145,572		$	30,335
Twelve months ended March 31, 2022
Revenue from external customers	$	1,319,578		$	1,405,594		$	481,422		$	3,206,594
Segment operating loss	$	(443,587	)	$	(662,808	)	$	(22,919	)	$	(1,129,314	)
Total assets at March 31, 2023	$	1,050,541		$	1,575,811		$	463,473		$	3,089,825
Total assets at March 31, 2022	$	1,365,789		$	1,463,317		$	520,557		$	3,349,663