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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2020	Jun. 30, 2019
Revenues	[1]	$ 29,941	$ 26,288
Consumables [Member] | Transferred at Point in Time [Member]
Revenues		14,261	12,757
Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		9,660	8,663
Service [Member] | Transferred at Point in Time [Member]
Revenues		3,415	2,886
Service [Member] | Transferred over Time [Member]
Revenues		2,605	1,982
Sterilzation and Disinfection Control [Member]
Revenues		13,067	12,110
Sterilzation and Disinfection Control [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		11,484	10,417
Sterilzation and Disinfection Control [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		129	186
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		250	300
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred over Time [Member]
Revenues		1,204	1,207
Instruments [Member]
Revenues		7,680	9,544
Instruments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		808	1,020
Instruments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		5,020	6,478
Instruments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		1,852	2,046
Instruments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		0	0
Biopharmaceutical Development [Member]
Revenues		5,949	0
Biopharmaceutical Development [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		1,939	0
Biopharmaceutical Development [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		2,556	0
Biopharmaceutical Development [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		782	0
Biopharmaceutical Development [Member] | Service [Member] | Transferred over Time [Member]
Revenues		672	0
Cold Chain Monitoring [Member]
Revenues		3,245	3,317
Cold Chain Monitoring [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		30	11
Cold Chain Monitoring [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		1,955	1,991
Cold Chain Monitoring [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		531	540
Cold Chain Monitoring [Member] | Service [Member] | Transferred over Time [Member]
Revenues		729	775
Cold Chain Packaging [Member]
Revenues		0	1,317
Cold Chain Packaging [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		0	1,309
Cold Chain Packaging [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		0	8
Cold Chain Packaging [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		0	0
Cold Chain Packaging [Member] | Service [Member] | Transferred over Time [Member]
Revenues		$ 0	$ 0
[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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-Name Accounting Standards Codification
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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
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
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-Section S99
-Paragraph 1
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