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Note 13 - Segment Data (Details) - Operating Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 15,714	$ 13,116	$ 12,676	$ 11,218	$ 12,808	$ 11,361	$ 11,706	$ 10,560	$ 10,968	$ 9,649	$ 9,702	$ 9,297	$ 52,724		$ 46,435		$ 39,616
Gross profit	9,585	7,706	7,600	6,797	8,211	6,947	7,248	6,456	6,464	5,885	5,774	5,388	31,688		28,862		23,511
Selling expenses													6,119		4,630		3,909
Impairment of intangible asset																	350
Gross profit after deducting selling expense and impairment of intangible assets													25,569		24,232		19,252
Reconciling items													(12,466)	[1]	(11,254)	[1]	(6,921)	[1]
Earnings before income taxes													13,103		12,978		12,331
Biological Indicators [Member]
Segment Reporting Information [Line Items]
Revenues													22,992		21,464		20,422
Gross profit													13,187		12,365		11,236
Selling expenses													1,350		1,552		1,607
Gross profit after deducting selling expense and impairment of intangible assets													11,837		10,813		9,629
Instruments [Member]
Segment Reporting Information [Line Items]
Revenues													26,389		24,971		19,194
Gross profit													16,904		16,497		12,275
Selling expenses													3,954		3,078		2,302
Impairment of intangible asset																	350
Gross profit after deducting selling expense and impairment of intangible assets													12,950		13,419		9,623
Continuous Monitoring [Member]
Segment Reporting Information [Line Items]
Revenues													3,343
Gross profit													1,597
Selling expenses													815
Gross profit after deducting selling expense and impairment of intangible assets													$ 782
[1] Reconciling items include 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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- Definition

Represents the amount of gross profit after deducting selling expenses and impairment of intangible asset for the period.

+ References

No definition available.

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- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

+ References

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- 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=26872669&loc=d3e20235-122688

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ 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=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Expenses recognized in the period that are directly related to the selling and distribution of products or services.

+ 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 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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