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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Oct. 01, 2012
Sep. 30, 2012
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items]        
Number of Reportable Segments 3us-gaap_NumberOfReportableSegments      
Number of Physical Locations in which Entity is Organized 6mlab_NumberOfPhysicalLocationsInWhichEntityIsOrganized      
Common Stock, Shares Authorized (in Shares) 25,000,000us-gaap_CommonStockSharesAuthorized 25,000,000us-gaap_CommonStockSharesAuthorized 25,000,000us-gaap_CommonStockSharesAuthorized 8,000,000us-gaap_CommonStockSharesAuthorized
Building [Member] | Maximum [Member]        
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 40 years      
Machinery and Equipment [Member] | Maximum [Member]        
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 7 years      
Computer Equipment [Member] | Maximum [Member]        
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 3 years      
Geographic Concentration Risk [Member] | UNITED STATES | Sales Revenue, Net [Member]        
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items]        
Concentration Risk, Percentage 64.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_US
     
Geographic Concentration Risk [Member] | Foreign Countries [Member] | Sales Revenue, Net [Member]        
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items]        
Concentration Risk, Percentage 36.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= mlab_ForeignCountriesMember
     
Maximum [Member]        
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items]        
Finite-Lived Intangible Asset, Useful Life 16 years      
Minimum [Member]        
Note 1 - Description of Business and Summary of Significant Accounting Policies (Details) [Line Items]        
Finite-Lived Intangible Asset, Useful Life 3 years