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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 25,142	$ 22,673
Consumables [Member] | Transferred at Point in Time [Member]
Revenues	12,166	10,531
Hardware [Member] | Transferred at Point in Time [Member]
Revenues	7,084	6,845
Service [Member] | Transferred at Point in Time [Member]
Revenues	3,393	3,137
Service [Member] | Transferred over Time [Member]
Revenues	2,499	2,160
Sterilzation and Disinfection Control [Member]
Revenues	11,348	10,183
Sterilzation and Disinfection Control [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues	9,570	8,669
Sterilzation and Disinfection Control [Member] | Hardware [Member] | Transferred at Point in Time [Member]
Revenues	204	133
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues	351	209
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred over Time [Member]
Revenues	1,223	1,172
Instruments [Member]
Revenues	8,731	8,603
Instruments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues	792	944
Instruments [Member] | Hardware [Member] | Transferred at Point in Time [Member]
Revenues	5,540	5,540
Instruments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues	2,399	2,119
Instruments [Member] | Service [Member] | Transferred over Time [Member]
Revenues
Cold Chain Monitoring [Member]
Revenues	3,223	2,917
Cold Chain Monitoring [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues	64	31
Cold Chain Monitoring [Member] | Hardware [Member] | Transferred at Point in Time [Member]
Revenues	1,340	1,172
Cold Chain Monitoring [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues	543	726
Cold Chain Monitoring [Member] | Service [Member] | Transferred over Time [Member]
Revenues	1,276	988
Cold Chain Packaging [Member]
Revenues	1,840	970
Cold Chain Packaging [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues	1,740	887
Cold Chain Packaging [Member] | Hardware [Member] | Transferred at Point in Time [Member]
Revenues
Cold Chain Packaging [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues	100	83
Cold Chain Packaging [Member] | Service [Member] | Transferred over Time [Member]
Revenues

X

- Definition

Amount, including 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Data Type:	na
Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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