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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: |