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Note 8 - Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Note 8 - Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan Age of Employees Covered	21
Defined Contribution Plan Service Time of Employees Covered	1 hour
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Cost Recognized (in Dollars)	$ 214,000	$ 214,000	$ 193,000
Bozeman [Member]
Note 8 - Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan Age of Employees Covered		21
Defined Contribution Plan Service Time of Employees Covered		1 year
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		4.00%

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:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	mlab_DefinedContributionPlanServiceTimeOfEmployeesCovered
Namespace Prefix:	mlab_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	mlab_Note8EmployeeBenefitPlansDetailsLineItems
Namespace Prefix:	mlab_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&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