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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
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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

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