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Note 9 - Segment Information (Details) - Operating Segment Information (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 17,830 us-gaap_SalesRevenueNet |  | $ 13,116 us-gaap_SalesRevenueNet |  | $ 52,770 us-gaap_SalesRevenueNet |  | $ 37,010 us-gaap_SalesRevenueNet |
Gross profit | 11,052 us-gaap_GrossProfit |  | 7,706 us-gaap_GrossProfit |  | 31,880 us-gaap_GrossProfit |  | 22,103 us-gaap_GrossProfit |
Selling expenses | 1,772 us-gaap_SellingExpense |  | 1,595 us-gaap_SellingExpense |  | 5,177 us-gaap_SellingExpense |  | 4,097 us-gaap_SellingExpense |
Gross profit after deducting selling expense and impairment of intangible asset | 9,280 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset |  | 6,111 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset |  | 26,703 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset |  | 18,006 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset |
Reconciling items | (5,567)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense | [1] | (3,384)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense | [1] | (15,354)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense | [1] | (9,326)mlab_GeneralAndAdministrativeResearchAndDevelopmentOtherExpense | [1]
Earnings before income taxes | 3,713 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 2,727 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 11,349 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 8,680 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Biological Indicators [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 6,964 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 5,317 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 19,822 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 16,181 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |
Gross profit | 4,194 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 2,976 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 12,029 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 9,019 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |
Selling expenses | 365 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 404 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 766 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 1,350 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |
Gross profit after deducting selling expense and impairment of intangible asset | 3,829 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 2,572 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 11,263 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |  | 7,669 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |
Instruments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 8,216 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 6,438 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 24,966 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 19,468 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |
Gross profit | 5,412 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 4,137 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 15,794 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 12,491 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |
Selling expenses | 919 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 1,047 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 3,093 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 2,603 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |
Gross profit after deducting selling expense and impairment of intangible asset | 4,493 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 3,090 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 12,701 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |  | 9,888 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember |
Continuous Monitoring [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 2,650 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 1,361 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 7,982 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 1,361 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |
Gross profit | 1,446 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 593 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 4,057 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 593 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |
Selling expenses | 488 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 144 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 1,318 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | 144 us-gaap_SellingExpense / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |
Gross profit after deducting selling expense and impairment of intangible asset | $ 958 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | $ 449 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | $ 2,739 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |  | $ 449 mlab_GrossProfitAfterDeductingSellingExpenseAndImpairmentOfIntangibleAsset / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |
[1] | Reconciling items include general and administrative, research and development, and other expenses.

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- Definition General and administrative, research and development, and other expenses which comprise the reconciling items of reportable segment earnings before tax to the entity's consolidated earnings before tax. + References No definition available. + Details
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- Definition Represents the amount of gross profit after deducting selling expenses and impairment of intangible asset for the period. + References No definition available. + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Expenses recognized in the period that are directly related to the selling and distribution of products or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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