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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 |  |  |  | $ 812,000 us-gaap_BusinessCombinationContingentConsiderationLiability | $ 1,620,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  |
Number of States Due Sales Tax |  |  |  |  |  | 1 mlab_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 | 500,000 us-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 | 704,065.86 us-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 |  |  |  | 460,000 us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = mlab_OtherAccruedExpensesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 1,408,000 us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent / us-gaap_BalanceSheetLocationAxis = mlab_OtherAccruedExpensesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 100,000 us-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 |  | 31,625,000 mlab_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 |  |  | 9,900,000 mlab_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 |  | 43,500,000 mlab_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 |  |  | 12,600,000 mlab_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 |  | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | 10,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  | 10,000,000 us-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 |  | 500,000 us-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 |  |  | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_PCDMember |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | 1,500,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_PCDMember |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  | 300,000 us-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 | $ 10,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = mlab_AnthonyAmatoAndAmegaScientificCorporationMember |  |  |  |  |  |
Loss Contingency,Expected Immeditate Accelaration of Stock Option Granted (in Shares) | 10,000 mlab_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
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 The plaintiffs seeks an immediate acceleration of the stock options which was granted upon initial employment. + References No definition available. + Details
Name: | mlab_LossContingencyExpectedImmeditateAccelarationOfStockOptionGranted
Namespace Prefix: | mlab_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | mlab_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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
Name: | us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow
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 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: 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 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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)) -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 + Details
Name: | us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mlab_AmegaScientificCorporationMember
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: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=mlab_AnthonyAmatoAndAmegaScientificCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=mlab_ImproperlyWithholdingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=mlab_LostFutureEarningsAndPunitiveDamagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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