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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 |  |  |  | $ 1,920,000 us-gaap_BusinessCombinationContingentConsiderationLiability | $ 1,620,000 us-gaap_BusinessCombinationContingentConsiderationLiability |
Number of States Due Sales Tax |  |  |  |  |  | 1 mlab_NumberOfStatesDueSalesTax
General and Administrative Expense [Member] | Other Accrued Expenses [Member] |  |  |  |  |  |
Note 7 - 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
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 | 31,625,000 mlab_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 | 43,500,000 mlab_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 |  | 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 |  |  |  |
Business Combination, Contingent Consideration, Liability | 500,000 us-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 |  | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | 6,710,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 2,140,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  | 1,120,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |
Business Acquisition Minimum Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration |  | 22,127,000 mlab_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 |  |  | 9,900,000 mlab_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 |  |  | 12,600,000 mlab_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 |  |  | 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 |  |  |

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
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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
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Namespace Prefix: | mlab_
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- 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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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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- 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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Balance Type: | credit
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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
Name: | us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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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: |