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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenues	[1]	$ 34,172	$ 31,655	$ 95,973	$ 83,479
Consumables [Member] | Transferred at Point in Time [Member]
Revenues		15,382	12,912	43,129	37,241
Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		12,052	12,109	33,033	28,656
Service [Member] | Transferred at Point in Time [Member]
Revenues		3,780	4,217	11,548	10,815
Service [Member] | Transferred over Time [Member]
Revenues		2,958	2,417	8,263	6,767
Corporate, Non-Segment [Member]
Revenues	[1]	0	229	0	2,442
Corporate, Non-Segment [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		0	229	0	2,415
Corporate, Non-Segment [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		0	0	0	0
Corporate, Non-Segment [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		0	0	0	27
Corporate, Non-Segment [Member] | Service [Member] | Transferred over Time [Member]
Revenues		0	0	0	0
Sterilization and Disinfection Control [Member] | Operating Segments [Member]
Revenues	[1]	13,077	11,619	37,696	35,823
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		11,250	9,948	32,252	30,487
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		151	95	388	429
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		433	360	1,389	1,301
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		1,243	1,216	3,667	3,606
Instruments [Member] | Operating Segments [Member]
Revenues	[1]	8,971	10,014	24,209	28,518
Instruments [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		717	781	2,240	2,364
Instruments [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		6,210	6,881	16,045	19,282
Instruments [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		2,042	2,352	5,922	6,872
Instruments [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		2	0	2	0
Biopharmaceutical Development [Member] | Operating Segments [Member]
Revenues	[1]	8,711	5,637	23,791	5,637
Biopharmaceutical Development [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		3,406	1,941	8,583	1,941
Biopharmaceutical Development [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		3,771	2,571	10,518	2,571
Biopharmaceutical Development [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		506	656	2,293	656
Biopharmaceutical Development [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		1,028	469	2,397	469
Continuous Monitoring [Member] | Operating Segments [Member]
Revenues		3,413	4,156	10,277	11,059
Continuous Monitoring [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		9	13	54	34
Continuous Monitoring [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		1,920	2,562	6,082	6,374
Continuous Monitoring [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		799	849	1,944	1,959
Continuous Monitoring [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		$ 685	$ 732	$ 2,197	$ 2,692
[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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