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Note 14 - Segment Information (Details) - Operating Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	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, 2015		Mar. 31, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 18,560us-gaap_SalesRevenueNet	$ 17,830us-gaap_SalesRevenueNet	$ 18,540us-gaap_SalesRevenueNet	$ 16,400us-gaap_SalesRevenueNet	$ 15,714us-gaap_SalesRevenueNet	$ 13,116us-gaap_SalesRevenueNet	$ 12,676us-gaap_SalesRevenueNet	$ 11,218us-gaap_SalesRevenueNet	$ 12,808us-gaap_SalesRevenueNet	$ 11,361us-gaap_SalesRevenueNet	$ 11,706us-gaap_SalesRevenueNet	$ 10,560us-gaap_SalesRevenueNet	$ 71,330us-gaap_SalesRevenueNet		$ 52,724us-gaap_SalesRevenueNet		$ 46,435us-gaap_SalesRevenueNet
Gross profit	11,512us-gaap_GrossProfit	11,052us-gaap_GrossProfit	11,123us-gaap_GrossProfit	9,705us-gaap_GrossProfit	9,585us-gaap_GrossProfit	7,706us-gaap_GrossProfit	7,600us-gaap_GrossProfit	6,797us-gaap_GrossProfit	8,211us-gaap_GrossProfit	6,947us-gaap_GrossProfit	7,248us-gaap_GrossProfit	6,456us-gaap_GrossProfit	43,392us-gaap_GrossProfit		31,688us-gaap_GrossProfit		28,862us-gaap_GrossProfit
Selling expenses													7,176us-gaap_SellingExpense		6,119us-gaap_SellingExpense		4,630us-gaap_SellingExpense
Gross profit after deducting selling expense and impairment of intangible asset													36,216mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset		25,569mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset		24,232mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset
Reconciling items													(20,869)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense	[1]	(12,466)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense	[1]	(11,254)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense	[1]
Earnings before income taxes													15,347us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		13,103us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		12,978us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Biological Indicators [Member]
Segment Reporting Information [Line Items]
Revenues													27,390us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		22,992us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		21,464us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Gross profit													17,142us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		13,187us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		12,365us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Selling expenses													1,551us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		1,350us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		1,552us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Gross profit after deducting selling expense and impairment of intangible asset													15,591mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		11,837mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember		10,813mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Instruments [Member]
Segment Reporting Information [Line Items]
Revenues													33,054us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		26,389us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		24,971us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Gross profit													20,763us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		16,904us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		16,497us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Selling expenses													3,441us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		3,954us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		3,078us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Gross profit after deducting selling expense and impairment of intangible asset													17,322mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		12,950mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember		13,419mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Continuous Monitoring [Member]
Segment Reporting Information [Line Items]
Revenues													10,886us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		3,343us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Gross profit													5,487us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		1,597us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Selling expenses													2,184us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		815us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Gross profit after deducting selling expense and impairment of intangible asset													$ 3,303mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember		$ 782mlab_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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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.

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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))

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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

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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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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