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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Litigation Settlement, Expense	$ 3,300		$ 3,300
Class Action In United States District Court [Member]
Litigation Settlement, Expense	$ 3,300

X

- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_LitigationCaseAxis=mlab_ClassActionInUnitedStatesDistrictCourtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: