Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
Mar. 31, 2016 USD ($)
Geographic Concentration Risk [Member] \| Sales Revenue, Net [Member] \| UNITED STATES
Concentration Risk, Percentage	63.00%
Geographic Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Foreign Countries [Member]
Concentration Risk, Percentage	37.00%
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
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	16 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Reclassification of Income Tax Expense [Member] \| March 31, 2016 [Member]
Current Period Reclassification Adjustment	$ (860,000)
Number of Operating Segments	4
Number of Physical Locations in Which Entity is Organized	8
Finite-Lived Intangible Asset, Useful Life

The amount of a reclassification adjustment made to current period financial statement amounts.

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- Definition

Represents the number of physical locations in which the entity is organized.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ 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=64851502&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=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

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.

+ References

No definition available.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

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.

+ References

No definition available.

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