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Note 5 - Inventories (Details Textual) - GPT Acquisition [Member] - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020 | Oct. 31, 2019 | Mar. 31, 2019
--- | --- | --- | --- | ---
Inventory Step-up Cost |  |  | $ 8,066 | $ 8,066
Inventories [Member] |  |  |  |
Inventory Step-up Cost | $ 0 | $ 2,901 |  |

X
- Definition Represents amount of inventory step up cost. + References No definition available. + Details
Name: | mlab_InventoryStepUpCost
Namespace Prefix: | mlab_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_BalanceSheetLocationAxis=us-gaap_InventoriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |