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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Mar. 31, 2018
Number of Operating Segments	4
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	59.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Countries [Member]
Concentration Risk, Percentage	41.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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-SubTopic 10
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