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Note 2 - Acquisitions and Dispositions (Details) - Adjusted Pro Forma Effect of Acquisitions on the Results of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
PCD Acquisition [Member] |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Adjusted Pro Forma Effect of Acquisitions on the Results of Operations [Line Items] |  |  |  |
Revenues | $ 73,068 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember | $ 56,541 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |
Net income | 9,673 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember | 9,512 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |
Basic | $ 2.75 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember | $ 2.76 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |
Diluted | $ 2.65 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember | $ 2.63 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember |  |
BGI [Member] |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Adjusted Pro Forma Effect of Acquisitions on the Results of Operations [Line Items] |  |  |  |
Revenues | 71,648 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember | 60,388 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember |  |
Net income | 9,661 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember | 11,141 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember |  |
Basic | $ 2.74 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember | $ 3.23 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember |  |
Diluted | $ 2.65 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember | $ 3.09 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember |  |
Amega Scientific Corporation [Member] |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Adjusted Pro Forma Effect of Acquisitions on the Results of Operations [Line Items] |  |  |  |
Revenues |  | 56,451 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember | 50,372 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |
Net income |  | 10,002 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember | 9,508 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |
Basic |  | $ 2.90 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember | $ 2.83 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |
Diluted |  | $ 2.77 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember | $ 2.65 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember |
TempSys [Member] |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Adjusted Pro Forma Effect of Acquisitions on the Results of Operations [Line Items] |  |  |  |
Revenues |  | 55,129 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember | 49,705 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |
Net income |  | 9,132 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember | 8,100 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |
Basic |  | $ 2.65 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember | $ 2.41 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |
Diluted |  | $ 2.53 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember | $ 2.25 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember |
Bios [Member] |  |  |  |
Note 2 - Acquisitions and Dispositions (Details) - Adjusted Pro Forma Effect of Acquisitions on the Results of Operations [Line Items] |  |  |  |
Revenues |  |  | 47,216 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember | 46,498 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Net income |  |  | $ 8,471 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember | $ 8,102 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Basic |  |  | $ 2.52 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember | $ 2.47 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Diluted |  |  | $ 2.36 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember | $ 2.34 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember

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