Note 5 - Segment Information (Tables)

9 Months Ended

Dec. 31, 2017

Notes Tables

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

	Chemical		Electronics			Engineering			Total
Three months ended December 31, 2017
Revenue from external customers	$	432,803	$	123,685		$	464,554		$	1,021,042
Segment operating income (loss)	$	25,646	$	22,111		$	(32,104	)	$	15,653
Nine months ended December 31, 2017
Revenue from external customers	$	1,051,914	$	960,442		$	1,224,747		$	3,237,103
Segment operating income	$	88,622	$	95,172		$	211,208		$	395,002
Three months ended December 31, 2016
Revenue from external customers	$	288,083	$	410,784		$	457,645		$	1,156,512
Segment operating income (loss)	$	27,225	$	(9,544	)	$	(57,591	)	$	(39,910	)
Nine months ended December 31, 2016
Revenue from external customers	$	942,931	$	1,347,857		$	1,623,493		$	3,914,281
Segment operating income	$	128,440	$	369,414		$	411,743		$	909,597
Total assets at December 31, 2017	$	1,453,802	$	1,327,382		$	1,692,666		$	4,473,850
Total assets at March 31, 2017	$	1,110,111	$	1,553,484		$	1,857,054		$	4,520,649