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Note 6 - Facility Relocation (Details Textual) - Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member]	12 Months Ended
	Mar. 31, 2017 USD ($)
Restructuring and Related Cost, Expected Cost	$ 2,100,000
Restructuring Charges	725,000
Biological Indicators [Member] | Facility Relocation, Retention Bonuses for Existing Personnel [Member]
Restructuring Charges	673,000
Biological Indicators [Member] | Facility Relocation, Duplicative Employment Costs [Member]
Restructuring Charges	49,000
Biological Indicators [Member] | Facility Relocation, Other [Member]
Restructuring Charges	3,000
Cost of Sales [Member]
Restructuring Charges	725,000
General and Administrative Expense [Member]
Restructuring Charges	$ 45,000

X

- Definition

Amount expected to be recognized in earnings for the specified restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Section S99
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