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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

X

- 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.

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