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Note 2 - Acquisitions and Dispositions (Details) - Purchase Price Allocation (USD $) | 0 Months Ended |  |  |  |
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Oct. 15, 2014 | Nov. 06, 2013 | May 15, 2012 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Apr. 15, 2014
Note 2 - Acquisitions and Dispositions (Details) - Purchase Price Allocation [Line Items] |  |  |  |  |  |  |
Contingent consideration liability |  |  |  | $ 812,000 us-gaap_BusinessCombinationContingentConsiderationLiability | $ 1,620,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  |
Goodwill |  |  |  | 44,869,000 us-gaap_Goodwill | 37,866,000 us-gaap_Goodwill | 23,640,000 us-gaap_Goodwill |
PCD Acquisition [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Purchase Price Allocation [Line Items] |  |  |  |  |  |  |
Cash consideration | 5,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Holdback payment liability | 250,000 mlab_BusinessCombinationHoldBackConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Contingent consideration liability | 300,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Aggregate consideration | 5,550,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Inventories, net | 137,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Property, plant and equipment, net | 7,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Intangibles, net | 3,678,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Goodwill | 1,743,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Accrued expenses | (15,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
Total purchase price allocation | 5,550,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |  |  |  |  |
BGI [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Purchase Price Allocation [Line Items] |  |  |  |  |  |  |
Inventories, net |  |  |  |  |  |  | 1,268,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Property, plant and equipment, net |  |  |  |  |  |  | 47,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Intangibles, net |  |  |  |  |  |  | 5,711,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Goodwill |  |  |  |  |  |  | 3,295,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Accrued expenses |  |  |  |  |  |  | (53,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Total purchase price allocation |  |  |  |  |  |  | 10,268,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Amega Scientific Corporation [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Purchase Price Allocation [Line Items] |  |  |  |  |  |  |
Cash consideration |  | 11,268,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Holdback payment liability |  | 1,000,000 mlab_BusinessCombinationHoldBackConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Contingent consideration liability |  | 500,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Aggregate consideration |  | 12,768,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Accounts receivable, net |  | 663,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Inventories, net |  | 410,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Prepaid expenses and other |  | 11,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Property, plant and equipment, net |  | 115,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Intangibles, net |  | 5,838,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Goodwill |  | 6,827,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Accrued salaries and payroll taxes |  | (53,000)mlab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedSalariesPayrollTaxesAndFeesOrBonus / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Unearned revenues |  | (1,043,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
Total purchase price allocation |  | 12,768,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |  |  |  |  |
TempSys [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Purchase Price Allocation [Line Items] |  |  |  |  |  |  |
Accounts receivable, net |  | 838,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Inventories, net |  | 447,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Prepaid expenses and other |  | 21,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Property, plant and equipment, net |  | 25,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Deferred income taxes |  | 585,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Intangibles, net |  | 6,135,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Goodwill |  | 6,820,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Accounts payable |  | (255,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Accrued salaries and payroll taxes |  | (2,134,000)mlab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedSalariesPayrollTaxesAndFeesOrBonus / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Unearned revenues |  | (485,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Accrued expenses |  | (135,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Deferred income taxes |  | (2,093,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Total purchase price allocation |  | 9,826,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Cash |  | 57,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |  |  |  |  |
Bios [Member] |  |  |  |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Purchase Price Allocation [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  | 16,660,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
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 |  |
Aggregate consideration |  |  | 18,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Accounts receivable, net |  |  | 478,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Inventories, net |  |  | 910,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Other current assets |  |  | 28,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Property, plant and equipment, net |  |  | 63,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Intangibles, net |  |  | 8,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Goodwill |  |  | 9,190,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Current liabilities |  |  | (69,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |
Total purchase price allocation |  |  | $ 18,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember |  |  |  |

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + 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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