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Note 8 - Employee Benefit Plans (Details) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |
Defined Contribution Plan Age of Employees Covered | 21 mlab_DefinedContributionPlanAgeOfEmployeesCovered |  |
Defined Contribution Plan Service Time of Employees Covered | 1 hour |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Defined Contribution Plan, Cost Recognized (in Dollars) | $ 330,000 us-gaap_DefinedContributionPlanCostRecognized | $ 214,000 us-gaap_DefinedContributionPlanCostRecognized | $ 214,000 us-gaap_DefinedContributionPlanCostRecognized
Bozeman [Member] |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |
Defined Contribution Plan Age of Employees Covered | 21 mlab_DefinedContributionPlanAgeOfEmployeesCovered / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mlab_BozemanMember |  |
Defined Contribution Plan Service Time of Employees Covered | 1 year |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mlab_BozemanMember |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mlab_BozemanMember |  |

X
- Definition Represents the eligible age of employees to participate in the defined contribution plan. + References No definition available. + Details
Name: | mlab_DefinedContributionPlanAgeOfEmployeesCovered
Namespace Prefix: | mlab_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the service time of employees to participate in the defined contribution plan. + References No definition available. + Details
Name: | mlab_DefinedContributionPlanServiceTimeOfEmployeesCovered
Namespace Prefix: | mlab_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | mlab_Note8EmployeeBenefitPlansDetailsLineItems
Namespace Prefix: | mlab_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=mlab_BozemanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |