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Note 8 - Segment Information (Details) - Operating Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 18,540		$ 12,676		$ 34,940		$ 23,894
Gross profit	11,123		7,600		20,828		14,397
Selling expenses	1,342		1,419		3,405		2,502
	9,781		6,181		17,423		11,895
Reconciling items	(5,038)	[1]	(3,243)	[1]	(9,787)	[1]	(5,942)	[1]
Earnings before income taxes	4,743		2,938		7,636		5,953
Biological Indicators [Member]
Segment Reporting Information [Line Items]
Revenues	6,441		6,010		12,858		10,864
Gross profit	4,051		3,482		7,835		6,043
Selling expenses	368		556		772		946
	3,683		2,926		7,063		5,097
Instruments [Member]
Segment Reporting Information [Line Items]
Revenues	9,065		6,666		16,750		13,030
Gross profit	5,455		4,118		10,382		8,354
Selling expenses	829		863		1,821		1,556
	4,626		3,255		8,561		6,798
Continuous Monitoring [Member]
Segment Reporting Information [Line Items]
Revenues	3,034				5,332
Gross profit	1,617				2,611
Selling expenses	145				812
	$ 1,472				$ 1,799
[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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Namespace Prefix:	mlab_
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

Name:	mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset
Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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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Namespace Prefix:	us-gaap_
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Period Type:	duration

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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Details

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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

+ Details

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