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Note 2 - Acquisitions and Dispositions (Details) (USD $) | 12 Months Ended | 1 Months Ended | 0 Months Ended |  |
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | May 31, 2015 | Aug. 12, 2013 | Oct. 15, 2014 | Nov. 06, 2013 | May 15, 2012 | Apr. 15, 2014
Note 2 - Acquisitions and Dispositions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 20,543,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 22,758,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 16,660,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability | 812,000 us-gaap_BusinessCombinationContingentConsiderationLiability | 1,620,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  | (1,020,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | 661,000 us-gaap_ProceedsFromDivestitureOfBusinesses |  |  |  |  |  |  |
Subsequent Event [Member] | Bios [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Payments for Previous Acquisition |  |  |  | 1,120,000 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |
Scenario, Previously Reported [Member] | Bios [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  |  | 2,140,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Nusonics Product Line Business [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  | 661,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember |  |  |  |
Disposal Group Not Discontinued Operation Carrying Value |  |  |  |  | 193,000 mlab_DisposalGroupNotDiscontinuedOperationCarryingValue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  | 468,000 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember |  |  |  |
Minimum [Member] | PCD Acquisition [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (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_PCDAcquisitionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Minimum [Member] | Amega Scientific Corporation [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (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 |  |
Maximum [Member] | PCD Acquisition [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (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_PCDAcquisitionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Maximum [Member] | Amega Scientific Corporation [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (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 |  |
PCD Acquisition [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition Agreement Holdback Payment Period from Effective Date Less Any Losses Incurred by Buyer Payable to Seller |  |  |  |  |  | 3 years |  |  |
Business Acquisition Earn Out Period for Determination of Contingent Consideration |  |  |  |  |  | 1 year |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low |  |  |  |  |  | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  | 1,500,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | 300,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  | 5,550,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |
BGI [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  | 10,268,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Amega Scientific Corporation [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition Agreement Holdback Payment Period from Effective Date Less Any Losses Incurred by Buyer Payable to Seller |  |  |  |  |  |  | 3 years |  |
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 Combination, Contingent Consideration, Liability |  |  |  |  |  |  | 500,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  | 12,768,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |
TempSys [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  | 16,660,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  | 9,826,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |
Bios [Member] |  |  |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (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 Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration |  |  |  |  |  |  |  | 22,127,000 mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |
Business Combination, Contingent Consideration, Liability |  | 1,120,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |  |  | 2,140,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  | 18,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  | $ 1,020,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |  |  |  |

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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- 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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- 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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- Definition Represents the carrying value of a disposal group that is not a discontinued operation. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- 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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- 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 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
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- 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=56956791&loc=d3e4845-128472 + Details
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- Definition Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721525-107759 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=51717284&loc=d3e1361-107760 Reference 3: 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=51716988&loc=d3e957-107759 + Details
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- 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=56944662&loc=d3e3213-108585 + Details
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- 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=56944662&loc=d3e3179-108585 + Details
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