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Note 6 - Facility Relocation (Details Textual) - Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring and Related Cost, Expected Cost, Total	$ 2,000,000
Restructuring Charges, Total	842,000
Biological Indicators [Member] | Facility Relocation, Retention Bonuses for Existing Personnel [Member]
Restructuring Charges, Total	350,000
Biological Indicators [Member] | Facility Relocation, Duplicative Employment Costs [Member]
Restructuring Charges, Total	122,000
Biological Indicators [Member] | Facility Relocation, Other [Member]
Restructuring Charges, Total	370,000
Cost of Sales [Member]
Restructuring Charges, Total	842,000	$ 725,000
General and Administrative Expense [Member]
Restructuring Charges, Total	$ 269,000	$ 45,000

X

- Definition

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

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