Note 5 - Segment Information - Summary of Segment Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Chemical [Member]
Revenue from external customers	$ 385,072	$ 340,470	$ 751,016	$ 637,629
Segment operating (loss)	(141,767)	67,924	59,133	155,403
Total assets at September 30, 2015	1,026,393		1,026,393		$ 509,732
Electronics [Member]
Revenue from external customers	202,374	318,203	377,603	560,413
Segment operating (loss)	(62,222)	29,756	(46,554)	20,920
Total assets at September 30, 2015	516,007		516,007		389,005
Engineering [Member]
Revenue from external customers	665,435	89,920	1,180,190	174,225
Segment operating (loss)	(143,926)	31,106	74,050	(11,804)
Total assets at September 30, 2015	1,612,786		1,612,786		442,680
Revenue from external customers	1,252,881	748,593	2,308,809	1,372,267
Segment operating (loss)	(347,915)	$ 128,786	86,629	$ 164,519
Total assets at September 30, 2015	$ 3,155,085		$ 3,155,085		$ 1,341,417