Note 9 - Segment Information - Summary of Segment Information (Details) - USD ($)	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment operating income	$ 1,138,561	$ 262,983
Revenues	5,271,231	4,513,070
Total assets	4,520,649	3,422,546
Chemical [Member]
Segment operating income	216,371	123,851
Revenues	1,285,353	1,412,179
Total assets	1,110,111	1,070,944
Electronics [Member]
Segment operating income	361,484	41,473
Revenues	1,820,490	849,447
Total assets	1,553,484	644,189
Engineering [Member]
Segment operating income	560,706	97,349
Revenues	2,165,388	2,251,444
Total assets	$ 1,857,054	$ 1,707,413

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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The net result for the period of deducting operating expenses from operating revenues.

+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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