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Note 11 - Segment Information - Operating Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenues		$ 23,671	$ 23,843	$ 69,298	$ 69,366
Gross profit (loss)		12,681	13,537	38,585	39,275
Reconciling items	[1]	(23,207)	(9,657)	(44,702)	(30,014)
Loss before income taxes		(10,526)	3,880	(6,117)	9,261
Sterilzation and Disinfection Control [Member]
Revenues		10,630	9,248	30,798	27,612
Gross profit (loss)		7,134	6,066	20,676	17,986
Reconciling items	[1]
Loss before income taxes
Instruments [Member]
Revenues		8,182	9,013	24,768	25,928
Gross profit (loss)		5,150	5,706	15,021	15,881
Reconciling items	[1]
Loss before income taxes
Cold Chain Monitoring [Member]
Revenues		3,267	3,102	9,335	8,964
Gross profit (loss)		(43)	1,254	2,044	3,578
Reconciling items	[1]
Loss before income taxes
Cold Chain Packaging [Member]
Revenues		1,592	2,480	4,397	6,862
Gross profit (loss)		440	511	844	1,830
Reconciling items	[1]
Loss before income taxes
[1] Reconciling items include selling, general and administrative, research and development, and other expenses.

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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 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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
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