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Note 5 - Facility Relocation (Details Textual) - USD ($)	1 Months Ended	9 Months Ended		12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Proceeds from Sale of Property, Plant, and Equipment		$ 1,133,000
Gain (Loss) on Disposition of Property Plant Equipment		116,000
Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member]
Restructuring and Related Cost, Expected Cost				$ 2,100,000
Restructuring Charges		772,000
Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] | Building [Member]
Proceeds from Sale of Property, Plant, and Equipment	$ 1,116,000
Gain (Loss) on Disposition of Property Plant Equipment	$ 116,000
Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] | Facility Relocation, Retention Bonuses for Existing Personnel [Member] | Sterilzation and Disinfection Control [Member]
Restructuring Charges		305,000
Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] | Facility Relocation, Duplicative Employment Costs [Member] | Sterilzation and Disinfection Control [Member]
Restructuring Charges		97,000
Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] | Facility Relocation, Moving Costs [Member] | Sterilzation and Disinfection Control [Member]
Restructuring Charges		370,000
Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] | Cost of Sales [Member]
Restructuring Charges		503,000		$ 725,000
Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] | General and Administrative Expense [Member]
Restructuring Charges		$ 269,000

X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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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)
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+ References

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-Name Accounting Standards Codification
-Topic 420
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