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Note 5 - Facility Relocation - Facility Relocation Costs (Details) - Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] $ in Thousands	9 Months Ended
	Dec. 31, 2018 USD ($)
Balance at March 31, 2018	$ 408
Facility Relocation Expense	17
Cash payments	(425)
Balance at December 31, 2018

X

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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