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Note 8 - Stock Transactions and Stock-based Compensation - Allocation of Share-based Compensation (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Stock-based compensation expense (A)	[1]	$ 4,212	$ 1,672	$ 1,411
Amount of income tax (benefit) expense recognized in earnings		(2,370)	(1,194)	(1,737)
Stock-based compensation expense (benefit), net of tax		$ 1,842	$ 478	$ (326)
[1] During the year ended March 31, 2019, we implemented a new full-administration equity compensation platform, and as a result, changed the methodology used to account for estimated forfeitures from a static method to a dynamic method. This change resulted in a one-time cumulative increase in expense of $945, recognized during the year ended March 31, 2019.

X

- Definition

The total recognized tax expense (benefit) related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlab_
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X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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X

- Definition

Amount, after tax, of expense for award under share-based payment arrangement.

+ References

No definition available.

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