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Note 5 - Facility Relocation (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2018	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
Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member]
Restructuring and Related Cost, Expected Cost, Total		$ 1,584

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Amount of gain (loss) on sale or disposal of assets utilized in financial service operations.

+ References

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

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

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