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Note 5 - Stock-Based Compensation (Details) - Allocation of Share-Based Compensation (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Allocation of Share-Based Compensation [Abstract] |  |  |  |
Total cost of stock-based compensation charged against income before income taxes | $ 260 us-gaap_AllocatedShareBasedCompensationExpense | $ 272 us-gaap_AllocatedShareBasedCompensationExpense | $ 776 us-gaap_AllocatedShareBasedCompensationExpense | $ 629 us-gaap_AllocatedShareBasedCompensationExpense
Amount of income tax benefit recognized in earnings | 92 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 98 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 274 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 228 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Amount charged against net income | $ 168 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 174 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 502 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 401 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Impact on net income per common share: |  |  |  |
Basic (in Dollars per share) | $ 0.05 mlab_ShareBasedCompensationEffectOnEarningPerShareBasic | $ 0.05 mlab_ShareBasedCompensationEffectOnEarningPerShareBasic | $ 0.14 mlab_ShareBasedCompensationEffectOnEarningPerShareBasic | $ 0.12 mlab_ShareBasedCompensationEffectOnEarningPerShareBasic
Diluted (in Dollars per share) | $ 0.05 mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted | $ 0.05 mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted | $ 0.14 mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted | $ 0.11 mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted

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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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