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Note 16 - Fair Value Measurements (Details Textual) - Infitrak Acquisition [Member]	12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2017 CAD
Business Combination, Contingent Consideration, Payment Installments	2	2
Business Combination, Payment of Contingent Consideration	$ 9,152,000	CAD 12,000,000

X

- Definition

Number of installments in which contingent consideration related to a business combination is paid or payable.

+ References

No definition available.

+ Details

Name:	mlab_BusinessCombinationContingentConsiderationPaymentInstallments
Namespace Prefix:	mlab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of contingent consideration paid by the acquirer.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mlab_InfitrakAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: