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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: