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Note 15 - Segment Data - Operating Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Reconciling items (1)	[1]													$ (38,943)	$ (35,858)	$ (28,045)
Earnings before income taxes														14,296	15,555	15,347
Revenues		$ 24,299	$ 23,843	$ 24,409	$ 21,114	$ 24,812	$ 19,913	$ 21,776	$ 18,158	$ 18,560	$ 17,830	$ 18,540	$ 16,400	93,665	84,659	71,330
Gross profit		$ 13,964	$ 13,537	$ 13,724	$ 12,014	$ 14,996	$ 12,209	$ 13,067	$ 11,141	$ 11,512	$ 11,052	$ 11,123	$ 9,705	53,239	51,413	43,392
Biological Indicators [Member]
Reconciling items (1)	[1]
Earnings before income taxes
Revenues														38,635	33,649	27,390
Gross profit														25,566	22,205	17,142
Instruments [Member]
Reconciling items (1)	[1]
Earnings before income taxes
Revenues														34,405	35,692	33,054
Gross profit														21,172	23,223	20,763
Cold Chain Monitoring [Member]
Reconciling items (1)	[1]
Earnings before income taxes
Revenues														12,584	11,566	10,886
Gross profit														4,533	4,201	5,487
Cold Chain Packaging [Member]
Reconciling items (1)	[1]
Earnings before income taxes
Revenues														8,041	3,752
Gross profit														$ 1,968	$ 1,784
[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
-Subparagraph (SX 210.4-08.(h)(1)(i))
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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)
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