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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Mar. 31, 2017
Number of Operating Segments	4
Number of Physical Locations in Which Entity is Organized	9
Finite-Lived Intangible Asset, Useful Life
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	16 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Building [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	3 years
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES
Concentration Risk, Percentage	57.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Countries [Member]
Concentration Risk, Percentage	43.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

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-Name Accounting Standards Codification
-Topic 275
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-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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