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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, 2021 | Mar. 31, 2020
Goodwill | $ 141,536 | $ 66,377
Effect of foreign currency translation | 11,337 | (2,653)
Acquisitions |  | 78,070
Impairment | 0 | (258)
Goodwill adjustment related to GPT acquisition | 7,968 |
Goodwill | 160,841 | 141,536
Corporate, Non-Segment [Member] |  |
Goodwill | 0 | 259
Effect of foreign currency translation | 0 | (1)
Acquisitions |  | 0
Impairment |  | (258)
Goodwill adjustment related to GPT acquisition | 0 |
Goodwill | 0 | 0
Sterilization and Disinfection Control [Member] | Operating Segments [Member] |  |
Goodwill | 29,594 | 29,780
Effect of foreign currency translation | 559 | (186)
Acquisitions |  | 0
Impairment |  | 0
Goodwill adjustment related to GPT acquisition | 0 |
Goodwill | 30,153 | 29,594
Instruments [Member] | Operating Segments [Member] |  |
Goodwill | 19,123 | 18,235
Effect of foreign currency translation | 63 | (20)
Acquisitions |  | 908
Impairment |  | 0
Goodwill adjustment related to GPT acquisition | 0 |
Goodwill | 19,186 | 19,123
Biopharmaceutical Development [Member] | Operating Segments [Member] |  |
Goodwill | 74,716 | 0
Effect of foreign currency translation | 10,715 | (2,446)
Acquisitions |  | 77,162
Impairment |  | 0
Goodwill adjustment related to GPT acquisition | 7,968 |
Goodwill | 93,399 | 74,716
Continuous Monitoring [Member] | Operating Segments [Member] |  |
Goodwill | 18,103 | 18,103
Effect of foreign currency translation | 0 | 0
Acquisitions |  | 0
Impairment |  | 0
Goodwill adjustment related to GPT acquisition | 0 |
Goodwill | $ 18,103 | $ 18,103

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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