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Note 9 - Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Biological Indicators [Member]
Revenues	$ 9,467	$ 7,236
Gross profit	6,087	4,749
Reconciling items (1)			[1]
Earnings before income taxes
Instruments [Member]
Revenues	8,222	8,331
Gross profit	4,849	5,355
Reconciling items (1)			[1]
Earnings before income taxes
Continuous Monitoring [Member]
Revenues	2,317	2,591
Gross profit	667	1,037
Reconciling items (1)			[1]
Earnings before income taxes
Cold Chain [member]
Revenues	1,108
Gross profit	411
Reconciling items (1)			[1]
Earnings before income taxes
Revenues	21,114	18,158
Gross profit	12,014	11,141
Reconciling items (1)	(9,845)	(7,615)	[1]
Earnings before income taxes	$ 2,169	$ 3,526
[1] Reconciling items include selling, general and administrative, research and development, and other expenses

X

- Definition

General and administrative, research and development, and other expenses which comprise the reconciling items of reportable segment earnings before tax to the entity's consolidated earnings before tax.

+ References

No definition available.

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X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ 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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- Definition

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ 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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

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

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