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Note 12 - Commitments and Contingencies (Details) (USD $)	1 Months Ended	0 Months Ended
	Nov. 30, 2014	Nov. 06, 2013	Oct. 15, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	May 15, 2012
Note 12 - Commitments and Contingencies (Details) [Line Items]
Business Combination, Contingent Consideration, Liability				$ 812,000us-gaap_BusinessCombinationContingentConsiderationLiability	$ 1,620,000us-gaap_BusinessCombinationContingentConsiderationLiability
Number of States Due Sales Tax						1mlab_NumberOfStatesDueSalesTax
Lost Future Earnings and Punitive Damages [Member] | Minimum [Member] | Anthony Amato and Amega Scientific Corporation [Member]
Note 12 - Commitments and Contingencies (Details) [Line Items]
Loss Contingency, Damages Sought, Value	500,000us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = mlab_AnthonyAmatoAndAmegaScientificCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mlab_LostFutureEarningsAndPunitiveDamagesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Improperly Withholding Amount [Member] | Anthony Amato and Amega Scientific Corporation [Member]
Note 12 - Commitments and Contingencies (Details) [Line Items]
Loss Contingency, Damages Sought, Value	704,065.86us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = mlab_AnthonyAmatoAndAmegaScientificCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = mlab_ImproperlyWithholdingAmountMember
General and Administrative Expense [Member] | Other Accrued Expenses [Member]
Note 12 - 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
Minimum [Member] | Amega Scientific Corporation [Member]
Note 12 - 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
Minimum [Member] | PCD [Member]
Note 12 - 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
Maximum [Member] | Amega Scientific Corporation [Member]
Note 12 - 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
Maximum [Member] | PCD [Member]
Note 12 - 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
Amega Scientific Corporation [Member]
Note 12 - 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					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					10,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
Business Acquisition Agreement Holdback Payment Period from Effective Date Less Any Losses Incurred by Buyer Payable to Seller		3 years
Business Combination, Contingent Consideration, Liability		500,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
PCD [Member]
Note 12 - 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
Anthony Amato and Amega Scientific Corporation [Member]
Note 12 - Commitments and Contingencies (Details) [Line Items]
Loss Contingency, Damages Sought, Value	$ 10,000,000us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = mlab_AnthonyAmatoAndAmegaScientificCorporationMember
Loss Contingency,Expected Immeditate Accelaration of Stock Option Granted (in Shares)	10,000mlab_LossContingencyExpectedImmeditateAccelarationOfStockOptionGranted / us-gaap_LitigationCaseAxis = mlab_AnthonyAmatoAndAmegaScientificCorporationMember

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

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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

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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

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X

- Definition

The plaintiffs seeks an immediate acceleration of the stock options which was granted upon initial employment.

+ References

No definition available.

+ Details

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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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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

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

-Section 35

-Paragraph 1

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-Section 25

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+ Details

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X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

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-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

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Period Type:	duration

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))

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15(a))

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

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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