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Note 9 - Segment Information (Tables)

9 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

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

		Three Months Ended December 31, 2014
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	6,964			$	8,216			$	2,650			$	17,830

Gross profit		$	4,194			$	5,412			$	1,446			$	11,052
Selling expenses			365				919				488				1,772
		$	3,829			$	4,493			$	958				9,280
Reconciling items ⁽¹⁾															(5,567	)
Earnings before income taxes														$	3,713

		Three Months Ended December 31, 2013
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	5,317			$	6,438			$	1,361			$	13,116

Gross profit		$	2,976			$	4,137			$	593			$	7,706
Selling expenses			404				1,047				144				1,595
		$	2,572			$	3,090			$	449				6,111
Reconciling items ⁽¹⁾															(3,384	)
Earnings before income taxes														$	2,727

		Nine Months Ended December 31, 2014
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	19,822			$	24,966			$	7,982			$	52,770

Gross profit		$	12,029			$	15,794			$	4,057			$	31,880
Selling expenses			766				3,093				1,318				5,177
		$	11,263			$	12,701			$	2,739				26,703
Reconciling items ⁽¹⁾															(15,354	)
Earnings before income taxes														$	11,349

		Nine Months Ended December 31, 2013
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	16,181			$	19,468			$	1,361			$	37,010

Gross profit		$	9,019			$	12,491			$	593			$	22,103
Selling expenses			1,350				2,603				144				4,097
		$	7,669			$	9,888			$	449				18,006
Reconciling items ⁽¹⁾															(9,326	)
Earnings before income taxes														$	8,680

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

		December 31, 2014				March 31, 2014
Total assets
Biological Indicators		$	25,921			$	22,771
Instruments			54,308				36,797
Continuous Monitoring			31,086				28,578
Corporate and administrative			4,863				9,383
		$	116,178			$	97,529

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

		Three Months Ended December 31,								Nine Months Ended December 31,
		2014				2013				2014				2013
Net revenues from unaffiliated customers:
United States		$	11,423			$	7,054			$	29,612			$	20,877
Foreign			6,407				6,062				23,158				16,133
		$	17,830			$	13,116			$	52,770			$	37,010

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.

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