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Note 2 - Acquisitions Dispositions (Details) (USD $)	9 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 15, 2014	Aug. 12, 2013	Mar. 31, 2014	Apr. 15, 2014
Note 2 - Acquisitions Dispositions (Details) [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 19,050,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	$ 22,758,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Business Combination, Contingent Consideration, Liability	1,920,000us-gaap_BusinessCombinationContingentConsiderationLiability				1,620,000us-gaap_BusinessCombinationContingentConsiderationLiability
Proceeds from Divestiture of Businesses		661,000us-gaap_ProceedsFromDivestitureOfBusinesses
PCD Acquisition [Member] | Minimum [Member]
Note 2 - Acquisitions Dispositions (Details) [Line Items]
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration			9,900,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
PCD Acquisition [Member] | Maximum [Member]
Note 2 - Acquisitions Dispositions (Details) [Line Items]
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration			12,600,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
PCD Acquisition [Member]
Note 2 - Acquisitions Dispositions (Details) [Line Items]
Business Acquisition Earn Out Period for Determination of Contingent Consideration			3 years
Business Acquisition Agreement Holdback Payment Period from Effective Date Less Any Losses Incurred by Buyer Payable to Seller			1 year
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low			0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			1,500,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Business Combination, Contingent Consideration, Liability	300,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember		300,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	5,550,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
BGI [Member]
Note 2 - Acquisitions Dispositions (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net						10,268,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Nusonics Product Line Business [Member]
Note 2 - Acquisitions Dispositions (Details) [Line Items]
Proceeds from Divestiture of Businesses				661,000us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember
Disposal Group Not Discontinued Operation Carrying Value				193,000mlab_DisposalGroupNotDiscontinuedOperationCarryingValue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax				$ 468,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember

X

- Definition

Represents the holdback payment period from the effective date, less any losses incurred by buyer, payable to seller, as defined in the agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the earn-out period over which the revenue growth will be assessed to determine the contingent consideration payable.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the cumulative revenue required based upon a sliding scale of three years subsequent to the acquisition for payment of contingent consideration.

+ References

No definition available.

+ Details

Name:	mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration
Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the carrying value of a disposal group that is not a discontinued operation.

+ References

No definition available.

+ Details

Name:	mlab_DisposalGroupNotDiscontinuedOperationCarryingValue
Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mlab_BGIMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mlab_PCDAcquisitionMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=mlab_NusonicsProductLineBusinessMember
Namespace Prefix:
Data Type:	na
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Period Type: