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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021
GPT Acquisition [Member] |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Accrued Expenses | $ 1,899 |
Liability for Collecting and Remitting Sales Tax States with Established Nexus [Member] |  |
Loss Contingency Accrual, Ending Balance | $ 2,700 | $ 2,714

X
- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to other accrued expenses assumed in connection with a business combination for which the initial accounting was incomplete. + References No definition available. + Details
Name: | mlab_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAccruedExpenses
Namespace Prefix: | mlab_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mlab_GPTAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=mlab_LiabilityForCollectingAndRemittingSalesTaxStatesWithEstablishedNexusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |