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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) | 9 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Number of Reportable Segments | 3 us-gaap_NumberOfReportableSegments
Number of Physical Locations in which Entity is Organized | 6 mlab_NumberOfPhysicalLocationsInWhichEntityIsOrganized

X
- Definition Represents the number of physical locations in which the entity is organized. + References No definition available. + Details
Name: | mlab_NumberOfPhysicalLocationsInWhichEntityIsOrganized
Namespace Prefix: | mlab_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration