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Note 10 - Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues		$ 22,954	$ 24,409	$ 45,627	$ 45,523
Gross profit		13,233	13,724	25,904	25,738
Reconciling items	[1]	(10,127)	(10,512)	(21,495)	(20,357)
Earnings before income taxes		3,106	3,212	4,409	5,381
Sterilzation and Disinfection Control [Member]
Revenues		9,985	8,897	20,168	18,364
Gross profit		6,822	5,833	13,542	11,920
Reconciling items	[1]
Earnings before income taxes
Instruments [Member]
Revenues		7,983	8,693	16,586	16,915
Gross profit		4,963	5,326	9,871	10,175
Reconciling items	[1]
Earnings before income taxes
Cold Chain Monitoring [Member]
Revenues		3,151	3,545	6,068	5,862
Gross profit		1,193	1,657	2,087	2,324
Reconciling items	[1]
Earnings before income taxes
Cold Chain Packaging [Member]
Revenues		1,835	3,274	2,805	4,382
Gross profit		255	908	404	1,319
Reconciling items	[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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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
-Paragraph 1
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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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-Section S99
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