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Note 9 - Segment Information (Details) - Operating Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2014		Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 17,830us-gaap_SalesRevenueNet		$ 13,116us-gaap_SalesRevenueNet		$ 52,770us-gaap_SalesRevenueNet		$ 37,010us-gaap_SalesRevenueNet
Gross profit	11,052us-gaap_GrossProfit		7,706us-gaap_GrossProfit		31,880us-gaap_GrossProfit		22,103us-gaap_GrossProfit
Selling expenses	1,772us-gaap_SellingExpense		1,595us-gaap_SellingExpense		5,177us-gaap_SellingExpense		4,097us-gaap_SellingExpense
Gross profit after deducting selling expense and impairment of intangible asset	9,280mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset		6,111mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset		26,703mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset		18,006mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset
Reconciling items	(5,567)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense	[1]	(3,384)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense	[1]	(15,354)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense	[1]	(9,326)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense	[1]
Earnings before income taxes	3,713us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		2,727us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		11,349us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		8,680us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Biological Indicators [Member]
Segment Reporting Information [Line Items]
Revenues	6,964us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		5,317us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		19,822us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		16,181us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Gross profit	4,194us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		2,976us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		12,029us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		9,019us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Selling expenses	365us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		404us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		766us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		1,350us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Gross profit after deducting selling expense and impairment of intangible asset	3,829mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		2,572mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		11,263mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		7,669mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Instruments [Member]
Segment Reporting Information [Line Items]
Revenues	8,216us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		6,438us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		24,966us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		19,468us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Gross profit	5,412us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		4,137us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		15,794us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		12,491us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Selling expenses	919us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		1,047us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		3,093us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		2,603us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Gross profit after deducting selling expense and impairment of intangible asset	4,493mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		3,090mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		12,701mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		9,888mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Continuous Monitoring [Member]
Segment Reporting Information [Line Items]
Revenues	2,650us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		1,361us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		7,982us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		1,361us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Gross profit	1,446us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		593us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		4,057us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		593us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Selling expenses	488us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		144us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		1,318us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		144us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Gross profit after deducting selling expense and impairment of intangible asset	$ 958mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		$ 449mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		$ 2,739mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		$ 449mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
[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

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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)

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- 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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- 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

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-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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- 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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