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Note 9 - Stock-Based Compensation (Details) - Allocation of Share-Based Compensation (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
Allocation of Share-Based Compensation [Abstract] |  |  |
Total cost of stock based compensation charged against income before income tax | $ 993 us-gaap_AllocatedShareBasedCompensationExpense | $ 840 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,112 us-gaap_AllocatedShareBasedCompensationExpense
Amount of income tax benefit recognized in earnings | 373 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 263 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 388 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Amount charged against net income | $ 620 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 577 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 724 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Impact on net income per common share: |  |  |
Basic (in Dollars per share) | $ 0.18 mlab_ShareBasedCompensationEffectOnEarningPerShareBasic | $ 0.17 mlab_ShareBasedCompensationEffectOnEarningPerShareBasic | $ 0.22 mlab_ShareBasedCompensationEffectOnEarningPerShareBasic
Diluted (in Dollars per share) | $ 0.17 mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted | $ 0.16 mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted | $ 0.20 mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted

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- Definition Represents the impact of share-based compensation in diluted earning per share computations. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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