Note 5 - Segment Information (Tables)

9 Months Ended

Dec. 31, 2016

Notes Tables

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

	Chemical Products		Electronics			Engineering Service			Total
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	$	(9,545	)	$	(57,590	)	$	(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
Three months ended December 31, 2015
Revenue from external customers	$	372,652	$	208,040		$	464,696		$	1,045,388
Segment operating income (loss)	$	113,469	$	(12,891	)	$	136,992		$	237,570
Nine months ended December 31, 2015
Revenue from external customers	$	1,123,668	$	585,643		$	1,644,886		$	3,354,197
Segment operating income (loss)	$	172,602	$	(59,445	)	$	211,042		$	324,199
Total assets at December 31, 2016	$	1,059,462	$	1,191,895		$	2,163,069		$	4,414,426
Total assets at March 31, 2016	$	1,070,944	$	644,189		$	1,707,413		$	3,422,546