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Note 6 - Restructuring and Relocation Costs (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Aug. 31, 2016
Bozeman [Member]
Proceeds from Sale of Productive Assets, Total		$ 2,222
Bozeman [Member] | Other Nonoperating Income (Expense) [Member]
Gain (Loss) on Disposition of Assets for Financial Service Operations, Total		288
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member]
Restructuring Charges, Total		150
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member] | Forecast [Member] | Minimum [Member]
Restructuring Charges, Total	$ 150
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member] | Forecast [Member] | Minimum [Member] | Employee Relocation [Member]
Restructuring Charges, Total	65
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member] | Forecast [Member] | Minimum [Member] | Third-party Costs [Member]
Restructuring Charges, Total	10
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member] | Forecast [Member] | Minimum [Member] | Lease Termination and Other Office Closure Costs [Member]
Restructuring Charges, Total	75
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member] | Forecast [Member] | Maximum [Member]
Restructuring Charges, Total	220
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member] | Forecast [Member] | Maximum [Member] | Employee Relocation [Member]
Restructuring Charges, Total	100
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member] | Forecast [Member] | Maximum [Member] | Third-party Costs [Member]
Restructuring Charges, Total	20
Closure of Markham, Canada Offices [Member] | Cold Chain Packaging [Member] | Forecast [Member] | Maximum [Member] | Lease Termination and Other Office Closure Costs [Member]
Restructuring Charges, Total	$ 100
Relocation of Omaha and Traverse City Sterilization and Disinfection Control Division Facilities [Member]
Restructuring Charges, Total		$ 17
Restructuring and Related Cost, Expected Cost, Total			$ 1,584

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- Definition

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+ References

No definition available.

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+ References

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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- Definition

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

+ References

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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