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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