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Note 8 - Goodwill and Long-lived Assets - Change in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Goodwill | $ 66,377 | $ 65,543
Effect of foreign currency translation | (2,654) | (790)
Acquisitions | 78,070 | 2,699
Impairment | (258) | (1,075)
Goodwill | 141,536 | 66,377
Corporate, Non-Segment [Member] |  |
Goodwill | 259 | 1,401
Effect of foreign currency translation | (1) | (67)
Impairment | (258) | (1,075)
Goodwill |  | 259
Sterilzation and Disinfection Control [Member] | Operating Segments [Member] |  |
Goodwill | 29,780 | 30,503
Effect of foreign currency translation | (186) | (723)
Goodwill | 29,594 | 29,780
Instruments [Member] | Operating Segments [Member] |  |
Goodwill | 18,235 | 18,235
Effect of foreign currency translation | (20) |
Acquisitions | 908 |
Goodwill | 19,123 | 18,235
Continuous Monitoring [Member] | Operating Segments [Member] |  |
Goodwill | 18,103 | 15,404
Acquisitions |  | 2,699
Goodwill | 18,103 | $ 18,103
Biopharmaceutical Development [Member] | Operating Segments [Member] |  |
Effect of foreign currency translation | (2,447) |
Acquisitions | 77,162 |
Goodwill | $ 74,716 |

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