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Note 9 - Stock-Based Compensation (Details) (USD $)	1 Months Ended	12 Months Ended			1 Months Ended
	Nov. 30, 2012	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Feb. 27, 2013	Oct. 18, 2004	Mar. 31, 2012	Sep. 23, 2010	Dec. 08, 2006	Oct. 21, 1999
Note 9 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Arrangements By Share Based Payment Award Exercise Price of Option Granted as Percentage of Bid Price of Underlying Shares		100.00%mlab_ShareBasedCompensationArrangementsByShareBasedPaymentAwardExercisePriceOfOptionGrantedAsPercentageOfBidPriceOfUnderlyingShares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		437,248us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	398,172us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	416,125us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber			433,785us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)		$ 3,546,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	$ 6,287,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	$ 2,742,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)		5,645,903us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		1,097,680us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share Based Compensation Arrangement By Share Based Payment Award Number of Nonvested Options Modified	14,400mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonvestedOptionsModified
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost (in Dollars)				$ 240,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Employee Stock Option [Member] | Minimum [Member]
Note 9 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		5 years
Employee Stock Option [Member] | Maximum [Member]
Note 9 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
The 2014 Plan [Member]
Note 9 - Stock-Based Compensation (Details) [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance		1,100,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = mlab_The2014PlanMember
Shares, Outstanding		2,320us-gaap_SharesOutstanding / us-gaap_PlanNameAxis = mlab_The2014PlanMember
The 2006 Plan [Member]
Note 9 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized								800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mlab_The2006PlanMember	400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mlab_The2006PlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		422,603us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mlab_The2006PlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized					400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = mlab_The2006PlanMember
The 1999 Plan [Member]
Note 9 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized										300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mlab_The1999PlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		12,325us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = mlab_The1999PlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized						200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = mlab_The1999PlanMember
Minimum [Member]
Note 9 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		6 years	5 years	5 years
Maximum [Member]
Note 9 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		7 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		8 years	10 years	10 years

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