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Note 9 - Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Revenues		$ 23,843	$ 19,913	$ 69,366	$ 59,847
Gross profit		13,537	12,209	39,275	36,417
Reconciling items (1)	[1]	(9,657)	(8,758)	(30,014)	(26,647)
Earnings before income taxes		3,880	3,451	9,261	9,770
Biological Indicators [Member]
Revenues		9,248	7,819	27,612	23,537
Gross profit		6,066	4,869	17,986	15,157
Reconciling items (1)	[1]
Earnings before income taxes
Instruments [Member]
Revenues		9,013	8,260	25,928	25,819
Gross profit		5,706	5,511	15,881	16,571
Reconciling items (1)	[1]
Earnings before income taxes
Cold Chain Monitoring [Member]
Revenues		3,102	2,853	8,964	7,954
Gross profit		1,254	1,313	3,578	3,326
Reconciling items (1)	[1]
Earnings before income taxes
Cold Chain Packaging [Member]
Revenues		2,480	981	6,862	2,537
Gross profit		511	516	1,830	1,363
Reconciling items (1)	[1]
Earnings before income taxes
[1] Reconciling items include selling, general and administrative, research and development, and other expenses

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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 210.5-03.1,2)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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