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Note 8 - Segment Information (Tables)

6 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

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

		Three Months Ended September 30, 2014
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	6,441			$	9,065			$	3,034			$	18,540
Gross profit		$	4,051			$	5,455			$	1,617			$	11,123
Selling expenses			368				829				145				1,342
		$	3,683			$	4,626			$	1,472				9,781
Reconciling items (1)															(5,038	)
Earnings before income taxes														$	4,743

		Three Months Ended September 30, 2013
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	6,010			$	6,666			$	--			$	12,676
Gross profit		$	3,482			$	4,118			$	--			$	7,600
Selling expenses			556				863				--				1,419
		$	2,926			$	3,255			$	--				6,181
Reconciling items (1)															(3,243	)
Earnings before income taxes														$	2,938

		Six Months Ended September 30, 2014
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	12,858			$	16,750			$	5,332			$	34,940
Gross profit		$	7,835			$	10,382			$	2,611			$	20,828
Selling expenses			772				1,821				812				3,405
		$	7,063			$	8,561			$	1,799				17,423
Reconciling items (1)															(9,787	)
Earnings before income taxes														$	7,636

		Six Months Ended September 30, 2013
		Biological Indicators				Instruments				Continuous Monitoring				Total
Revenues		$	10,864			$	13,030			$	--			$	23,894
Gross profit		$	6,043			$	8,354			$	--			$	14,397
Selling expenses			946				1,556				--				2,502
		$	5,097			$	6,798			$	--				11,895
Reconciling items (1)															(5,942	)
Earnings before income taxes														$	5,953

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

		September 30, 2014				March 31, 2014
Total assets
Biological Indicators		$	26,582			$	22,771
Instruments			46,023				36,797
Continuous Monitoring			31,182				28,578
Corporate and administrative			8,313				9,383
		$	112,100			$	97,529

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

		Three Months Ended September 30,								Six Months Ended September 30,
		2014				2013				2014				2013
Net revenues from unaffiliated customers:
United States		$	9,698			$	7,794			$	18,189			$	13,824
Foreign			8,842				4,882				16,751				10,070
		$	18,540			$	12,676			$	34,940			$	23,894

X

- Definition

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

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