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Note 7 - Commitments and Contingencies (Details) (USD $)	0 Months Ended
	Nov. 06, 2013	May 15, 2012	Oct. 15, 2014	Dec. 31, 2014	Mar. 31, 2014	Mar. 31, 2013
Note 7 - Commitments and Contingencies (Details) [Line Items]
Business Combination, Contingent Consideration, Liability				$ 1,920,000us-gaap_BusinessCombinationContingentConsiderationLiability	$ 1,620,000us-gaap_BusinessCombinationContingentConsiderationLiability
Number of States Due Sales Tax						1mlab_NumberOfStatesDueSalesTax
General and Administrative Expense [Member] | Other Accrued Expenses [Member]
Note 7 - Commitments and Contingencies (Details) [Line Items]
Sales and Excise Tax Payable				460,000us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = mlab_OtherAccruedExpensesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	1,408,000us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = mlab_OtherAccruedExpensesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	100,000us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = mlab_OtherAccruedExpensesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Amega Scientific Corporation [Member] | Minimum [Member]
Note 7 - Commitments and Contingencies (Details) [Line Items]
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration	31,625,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Amega Scientific Corporation [Member] | Maximum [Member]
Note 7 - Commitments and Contingencies (Details) [Line Items]
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration	43,500,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Amega Scientific Corporation [Member]
Note 7 - Commitments and Contingencies (Details) [Line Items]
Business Acquisition Earn Out Period for Determination of Contingent Consideration	3 years
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low		0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		10,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
Business Combination, Contingent Consideration, Liability	500,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
Bios [Member]
Note 7 - Commitments and Contingencies (Details) [Line Items]
Business Acquisition Earn Out Period for Determination of Contingent Consideration		3 years
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low		0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		6,710,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Business Combination, Contingent Consideration, Liability		2,140,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember			1,120,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Business Acquisition Minimum Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration		22,127,000mlab_BusinessAcquisitionMinimumRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
PCD [Member] | Minimum [Member]
Note 7 - Commitments and Contingencies (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_PCDMember / us-gaap_RangeAxis = us-gaap_MinimumMember
PCD [Member] | Maximum [Member]
Note 7 - Commitments and Contingencies (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_PCDMember / us-gaap_RangeAxis = us-gaap_MaximumMember
PCD [Member]
Note 7 - Commitments and Contingencies (Details) [Line Items]
Business Acquisition Earn Out Period for Determination of Contingent Consideration			3 years
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low			0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_PCDMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			1,500,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_PCDMember
Business Combination, Contingent Consideration, Liability			$ 300,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDMember

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 minimum revenue required in three years subsequent to the acquisition for payment of contingent consideration.

+ References

No definition available.

+ Details

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

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
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X

- Definition

This element represents the number of states to which the company has an estimated state sales tax due for the reporting period.

+ References

No definition available.

+ Details

Name:	mlab_NumberOfStatesDueSalesTax
Namespace Prefix:	mlab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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

Carrying value as of the balance sheet date of liabilities incurred through that date and payable for statutory sales and use taxes, including value added tax.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mlab_AmegaScientificCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mlab_BiosMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mlab_PCDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: