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Note 6 - Facility Relocation (Details Textual) - Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member] | 12 Months Ended
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Mar. 31, 2017 USD ($)
Restructuring and Related Cost, Expected Cost | $ 2,100,000
Restructuring Charges | 725,000
Biological Indicators [Member] | Facility Relocation, Retention Bonuses for Existing Personnel [Member] |
Restructuring Charges | 673,000
Biological Indicators [Member] | Facility Relocation, Duplicative Employment Costs [Member] |
Restructuring Charges | 49,000
Biological Indicators [Member] | Facility Relocation, Other [Member] |
Restructuring Charges | 3,000
Cost of Sales [Member] |
Restructuring Charges | 725,000
General and Administrative Expense [Member] |
Restructuring Charges | $ 45,000

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