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Note 9 - Employee Benefit Plans (Details Textual)	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Mar. 31, 2018 USD ($) h	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Defined Contribution Plan Age of Employees Covered		21
Defined Contribution Plan Service Number of Hours of Employees Covered | h		1
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%	4.00%
Defined Contribution Plan, Cost | $		$ 680,000	$ 501,000	$ 387,000

X

- Definition

Represents the eligible age of employees to participate in the defined contribution plan.

+ References

No definition available.

+ Details

Name:	mlab_DefinedContributionPlanAgeOfEmployeesCovered
Namespace Prefix:	mlab_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of hours of service time of employees to participate in the defined contribution plan.

+ References

No definition available.

+ Details

Name:	mlab_DefinedContributionPlanServiceNumberOfHoursOfEmployeesCovered
Namespace Prefix:	mlab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration