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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Revenues	[1]	$ 26,288	$ 25,142
Consumables [Member] | Transferred at Point in Time [Member]
Revenues		12,757	12,166
Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		8,663	7,084
Service [Member] | Transferred at Point in Time [Member]
Revenues		2,886	3,393
Service [Member] | Transferred over Time [Member]
Revenues		1,982	2,499
Sterilzation and Disinfection Control [Member]
Revenues	[1]	12,110	11,348
Sterilzation and Disinfection Control [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		10,417	9,570
Sterilzation and Disinfection Control [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		186	204
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		300	351
Sterilzation and Disinfection Control [Member] | Service [Member] | Transferred over Time [Member]
Revenues		1,207	1,223
Instruments [Member]
Revenues	[1]	9,544	8,731
Instruments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		1,020	792
Instruments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		6,478	5,540
Instruments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		2,046	2,399
Instruments [Member] | Service [Member] | Transferred over Time [Member]
Revenues
Cold Chain Monitoring [Member]
Revenues	[1]	3,317	3,223
Cold Chain Monitoring [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		11	64
Cold Chain Monitoring [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		1,991	1,340
Cold Chain Monitoring [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		540	543
Cold Chain Monitoring [Member] | Service [Member] | Transferred over Time [Member]
Revenues		775	1,276
Cold Chain Packaging [Member]
Revenues	[1]	1,317	1,840
Cold Chain Packaging [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		1,309	1,740
Cold Chain Packaging [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		8
Cold Chain Packaging [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues			100
Cold Chain Packaging [Member] | Service [Member] | Transferred over Time [Member]
Revenues
[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 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

+ Details

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