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Note 8 - Segment Information (Details) - Operating Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 16,400		$ 11,218
Gross profit	9,705		6,797
Selling expenses	2,063		1,083
Gross profit after deducting selling expense and impairment of intangible assets	7,642		5,714
Reconciling items	(4,749)	[1]	(2,699)	[1]
Earnings before income taxes	2,893		3,015
Biological Indicators [Member]
Segment Reporting Information [Line Items]
Revenues	6,417		4,854
Gross profit	3,784		2,561
Selling expenses	404		390
Gross profit after deducting selling expense and impairment of intangible assets	3,380		2,171
Instruments [Member]
Segment Reporting Information [Line Items]
Revenues	7,685		6,364
Gross profit	4,927		4,236
Selling expenses	992		693
Gross profit after deducting selling expense and impairment of intangible assets	3,935		3,543
Continuous Monitoring [Member]
Segment Reporting Information [Line Items]
Revenues	2,298
Gross profit	994
Selling expenses	667
Gross profit after deducting selling expense and impairment of intangible assets	$ 327
[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.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
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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=26872669&loc=d3e20235-122688

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X

- Definition

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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X

- 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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X

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

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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