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Note 7 - Stockholders' Equity (Details) - Dividends per Share (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
First Quarter [Member] |  |  |
Note 7 - Stockholders' Equity (Details) - Dividends per Share [Line Items] |  |  |
Dividends Paid | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_FirstQuarterMember | $ 0.14 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_FirstQuarterMember | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_FirstQuarterMember
Second Quarter [Member] |  |  |
Note 7 - Stockholders' Equity (Details) - Dividends per Share [Line Items] |  |  |
Dividends Paid | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_SecondQuarterMember | $ 0.14 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_SecondQuarterMember | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_SecondQuarterMember
Third Quarter [Member] |  |  |
Note 7 - Stockholders' Equity (Details) - Dividends per Share [Line Items] |  |  |
Dividends Paid | $ 0.16 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_ThirdQuarterMember | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_ThirdQuarterMember | $ 0.14 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_ThirdQuarterMember
Fourth Quarter [Member] |  |  |
Note 7 - Stockholders' Equity (Details) - Dividends per Share [Line Items] |  |  |
Dividends Paid | $ 0.16 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_FourthQuarterMember | $ 0.15 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_FourthQuarterMember | $ 0.14 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = mlab_FourthQuarterMember

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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