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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Revenue	[1]	$ 117,687	$ 103,135	$ 96,179
Corporate, Non-Segment [Member]
Revenue	[1]	2,463	6,907	5,837
Sterilzation and Disinfection Control [Member] | Operating Segments [Member]
Revenue	[1]	49,660	46,297	43,260
Instruments [Member] | Operating Segments [Member]
Revenue	[1]	37,984	36,125	34,104
Biopharmaceutical Development [Member] | Operating Segments [Member]
Revenue	[1]	13,851
Continuous Monitoring [Member] | Operating Segments [Member]
Revenue	[1]	13,729	13,806	12,978
Consumables [Member] | Transferred at Point in Time [Member]
Revenue		53,311	49,589	44,974
Consumables [Member] | Transferred at Point in Time [Member] | Corporate, Non-Segment [Member]
Revenue		2,436	6,430	5,197
Consumables [Member] | Transferred at Point in Time [Member] | Sterilzation and Disinfection Control [Member] | Operating Segments [Member]
Revenue		42,654	39,670	36,436
Consumables [Member] | Transferred at Point in Time [Member] | Instruments [Member] | Operating Segments [Member]
Revenue		3,197	3,101	3,080
Consumables [Member] | Transferred at Point in Time [Member] | Biopharmaceutical Development [Member] | Operating Segments [Member]
Revenue		4,981
Consumables [Member] | Transferred at Point in Time [Member] | Continuous Monitoring [Member] | Operating Segments [Member]
Revenue		43	388	261
Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenue		40,090	32,209	29,412
Hardware and Software [Member] | Transferred at Point in Time [Member] | Corporate, Non-Segment [Member]
Revenue			142	91
Hardware and Software [Member] | Transferred at Point in Time [Member] | Sterilzation and Disinfection Control [Member] | Operating Segments [Member]
Revenue		551	580	925
Hardware and Software [Member] | Transferred at Point in Time [Member] | Instruments [Member] | Operating Segments [Member]
Revenue		25,627	24,500	23,345
Hardware and Software [Member] | Transferred at Point in Time [Member] | Biopharmaceutical Development [Member] | Operating Segments [Member]
Revenue		6,015
Hardware and Software [Member] | Transferred at Point in Time [Member] | Continuous Monitoring [Member] | Operating Segments [Member]
Revenue		7,897	6,987	5,051
Service [Member]
Revenue		24,286	21,337	21,793
Service [Member] | Sterilzation and Disinfection Control [Member] | Operating Segments [Member]
Revenue			4,838
Service [Member] | Transferred at Point in Time [Member]
Revenue		14,936	12,069	11,355
Service [Member] | Transferred at Point in Time [Member] | Corporate, Non-Segment [Member]
Revenue		27	335	549
Service [Member] | Transferred at Point in Time [Member] | Sterilzation and Disinfection Control [Member] | Operating Segments [Member]
Revenue		1,592	1,209	1,110
Service [Member] | Transferred at Point in Time [Member] | Instruments [Member] | Operating Segments [Member]
Revenue		9,160	8,524	7,679
Service [Member] | Transferred at Point in Time [Member] | Biopharmaceutical Development [Member] | Operating Segments [Member]
Revenue		1,761
Service [Member] | Transferred at Point in Time [Member] | Continuous Monitoring [Member] | Operating Segments [Member]
Revenue		2,396	2,001	2,017
Service [Member] | Transferred over Time [Member]
Revenue		9,350	9,268	10,438
Service [Member] | Transferred over Time [Member] | Sterilzation and Disinfection Control [Member] | Operating Segments [Member]
Revenue		4,863		4,789
Service [Member] | Transferred over Time [Member] | Biopharmaceutical Development [Member] | Operating Segments [Member]
Revenue		1,094
Service [Member] | Transferred over Time [Member] | Continuous Monitoring [Member] | Operating Segments [Member]
Revenue		$ 3,393	$ 4,430	$ 5,649
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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