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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Revenues	[1]	$ 34,920	$ 29,941
Consumables [Member] | Transferred at Point in Time [Member]
Revenues		17,436	14,261
Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		10,799	9,660
Service [Member] | Transferred at Point in Time [Member]
Revenues		3,518	3,415
Service [Member] | Transferred over Time [Member]
Revenues		3,167	2,605
Sterilization and Disinfection Control [Member] | Operating Segments [Member]
Revenues	[1]	15,150	13,067
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		12,876	11,484
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		160	129
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		701	250
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		1,413	1,204
Biopharmaceutical Development [Member] | Operating Segments [Member]
Revenues	[1]	8,877	5,949
Biopharmaceutical Development [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		3,608	1,939
Biopharmaceutical Development [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		3,557	2,556
Biopharmaceutical Development [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		582	782
Biopharmaceutical Development [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		1,130	672
Instruments [Member] | Operating Segments [Member]
Revenues	[1]	7,562	7,680
Instruments [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		942	808
Instruments [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		5,238	5,020
Instruments [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		1,382	1,852
Instruments [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues			0
Continuous Monitoring [Member] | Operating Segments [Member]
Revenues	[1]	3,331	3,245
Continuous Monitoring [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		10	30
Continuous Monitoring [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		1,844	1,955
Continuous Monitoring [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		853	531
Continuous Monitoring [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		$ 624	$ 729
[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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

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