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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019
Revenues	[1]	$ 31,860		$ 25,536		$ 61,801		$ 51,824
Consumables [Member] | Transferred at Point in Time [Member]
Revenues		13,486		11,572		27,747		24,329
Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		11,321		7,892		20,981		16,547
Service [Member] | Transferred at Point in Time [Member]
Revenues		4,353		3,704		7,768		6,598
Service [Member] | Transferred over Time [Member]
Revenues		2,700		2,368		5,305		4,350
Corporate, Non-Segment [Member]
Revenues		0		896	[1]			2,213	[1]
Corporate, Non-Segment [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		0		877				2,186
Corporate, Non-Segment [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		0		0
Corporate, Non-Segment [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		0		19				27
Corporate, Non-Segment [Member] | Service [Member] | Transferred over Time [Member]
Revenues		0		0
Sterilization and Disinfection Control [Member] | Operating Segments [Member]
Revenues	[1]	11,552		12,094		24,619		24,204
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		9,518		10,122		21,002		20,539
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		108		148		237		334
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		706		641		956		941
Sterilization and Disinfection Control [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		1,220		1,183		2,424		2,390
Instruments [Member] | Operating Segments [Member]
Revenues	[1]	7,558		8,960		15,238		18,504
Instruments [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		715		563		1,523		1,583
Instruments [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		4,815		5,923		9,835		12,401
Instruments [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		2,028		2,474		3,880		4,520
Instruments [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		0		0
Biopharmaceutical Development [Member] | Operating Segments [Member]
Revenues		9,131	[1]	0		15,080	[1]
Biopharmaceutical Development [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		3,238		0		5,177
Biopharmaceutical Development [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		4,191		0		6,747
Biopharmaceutical Development [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		1,005		0		1,787
Biopharmaceutical Development [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		697		0		1,369
Continuous Monitoring [Member] | Operating Segments [Member]
Revenues		3,619		3,586		6,864		6,903
Continuous Monitoring [Member] | Operating Segments [Member] | Consumables [Member] | Transferred at Point in Time [Member]
Revenues		15		10		45		21
Continuous Monitoring [Member] | Operating Segments [Member] | Hardware and Software [Member] | Transferred at Point in Time [Member]
Revenues		2,207		1,821		4,162		3,812
Continuous Monitoring [Member] | Operating Segments [Member] | Service [Member] | Transferred at Point in Time [Member]
Revenues		614		570		1,145		1,110
Continuous Monitoring [Member] | Operating Segments [Member] | Service [Member] | Transferred over Time [Member]
Revenues		$ 783		$ 1,185		$ 1,512		$ 1,960
[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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