Note 6 - Goodwill and Intangible Assets - Change in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Goodwill	$ 160,841
Goodwill	291,166	$ 160,841
Agena [Member]
Goodwill	135,880
Corporate, Non-Segment [Member]
Goodwill	160,841	141,536
Effect of foreign currency translation	(5,555)	11,337
Goodwill	291,166	160,841
Corporate, Non-Segment [Member] \| GPT Acquisition [Member]
Goodwill adjustment related to acquisition		7,968
Corporate, Non-Segment [Member] \| Agena [Member]
Goodwill adjustment related to acquisition	135,880
Sterilization and Disinfection Control [Member] \| Operating Segments [Member]
Goodwill	30,153	29,594
Effect of foreign currency translation	(403)	559
Goodwill	29,750	30,153
Sterilization and Disinfection Control [Member] \| Operating Segments [Member] \| GPT Acquisition [Member]
Goodwill adjustment related to acquisition		0
Sterilization and Disinfection Control [Member] \| Operating Segments [Member] \| Agena [Member]
Goodwill adjustment related to acquisition	0
Biopharmaceutical Development [Member] \| Operating Segments [Member]
Goodwill	93,399	74,716
Effect of foreign currency translation	(5,134)	10,715
Goodwill	88,265	93,399
Biopharmaceutical Development [Member] \| Operating Segments [Member] \| GPT Acquisition [Member]
Goodwill adjustment related to acquisition		7,968
Biopharmaceutical Development [Member] \| Operating Segments [Member] \| Agena [Member]
Goodwill adjustment related to acquisition	0
Calibration Solutions [Member] \| Operating Segments [Member]
Goodwill	37,289	37,226
Effect of foreign currency translation	(52)	63
Goodwill	37,237	37,289
Calibration Solutions [Member] \| Operating Segments [Member] \| GPT Acquisition [Member]
Goodwill adjustment related to acquisition		0
Calibration Solutions [Member] \| Operating Segments [Member] \| Agena [Member]
Goodwill adjustment related to acquisition	0
Clinical Genomics [Member] \| Operating Segments [Member]
Goodwill	0	0
Effect of foreign currency translation	34	0
Goodwill	135,914	0
Clinical Genomics [Member] \| Operating Segments [Member] \| GPT Acquisition [Member]
Goodwill adjustment related to acquisition		$ 0
Clinical Genomics [Member] \| Operating Segments [Member] \| Agena [Member]
Goodwill adjustment related to acquisition	$ 135,880

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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