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Note 14 - Segment Information (Tables)

12 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Year Ended March 31, 2015
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	27,390			$	33,054			$	10,886			$	71,330
Gross profit		$	17,142			$	20,763			$	5,487			$	43,392
Selling expenses			1,551				3,441				2,184				7,176
		$	15,591			$	17,322			$	3,303				36,216
Reconciling items (1)															(20,869	)
Earnings before income taxes														$	15,347

		Year Ended March 31, 2014
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	22,992			$	26,389			$	3,343			$	52,724
Gross profit		$	13,187			$	16,904			$	1,597			$	31,688
Selling expenses			1,350				3,954				815				6,119
		$	11,837			$	12,950			$	782				25,569
Reconciling items (1)															(12,466	)
Earnings before income taxes														$	13,103

		Year Ended March 31, 2013
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	21,464			$	24,971			$	--			$	46,435
Gross profit		$	12,365			$	16,497			$	--			$	28,862
Selling expenses			1,552				3,078				--				4,630
		$	10,813			$	13,419			$	--				24,232
Reconciling items (1)															(11,254	)
Earnings before income taxes														$	12,978

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

		Year Ended March 31,
		2015				2014				2013
Revenues from unaffiliated customers
United States		$	45,798			$	29,551			$	28,590
Foreign			25,532				23,173				17,845
		$	71,330			$	52,724			$	46,435

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

		March 31,
		2015				2014
Total assets
Biological Indicators		$	36,304			$	22,771
Instruments			44,401				36,797
Continuous Monitoring			31,558				28,578
Corporate and administrative			5,057				9,383
		$	117,320			$	97,529

X

- Definition

Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 31

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 21

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