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Note 6 - Long-Term Debt (Details) (USD $) | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Feb. 29, 2012 | Apr. 30, 2014
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Long-term Line of Credit (in Dollars) | 16,500,000 us-gaap_LineOfCredit |  |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Minimum [Member] | Debt Instrument Variable Rate Base CBFR Using One Month LIBOR [Member] | Line of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | (1.25%)us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = mlab_DebtInstrumentVariableRateBaseCBFRUsingOneMonthLIBORMember |  |
Minimum [Member] | Line of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Line of Credit Facility, Unused Capacity Fee Ratio of Funded Debt to EBITDA High End of Range | 2 mlab_LineOfCreditFacilityUnusedCapacityFeeRatioOfFundedDebtToEBITDAHighEndOfRange / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Debt Instrument Covenant Fixed Charge Coverage Ratio | 1.35 mlab_DebtInstrumentCovenantFixedChargeCoverageRatio / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Maximum [Member] | Debt Instrument Variable Rate Base CBFR Using One Month LIBOR [Member] | Line of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | (0.50%)us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = mlab_DebtInstrumentVariableRateBaseCBFRUsingOneMonthLIBORMember |  |
Maximum [Member] | Line of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Line of Credit Facility Unused Capacity Fee Ratio of Funded Debt to EBITDA Low End of Range | 1 mlab_LineOfCreditFacilityUnusedCapacityFeeRatioOfFundedDebtToEBITDALowEndOfRange / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = mlab_TermLoanMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Debt Instrument Variable Rate Base CBFR Using One Month LIBOR [Member] | Line of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Debt Instrument Basis Spread on Variable Rate Used to Calculate Commercial Bank Floating Rate | 2.50%mlab_DebtInstrumentBasisSpreadOnVariableRateUsedToCalculateCommercialBankFloatingRate / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = mlab_DebtInstrumentVariableRateBaseCBFRUsingOneMonthLIBORMember |  |
Line of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Debt Instrument, Term |  | 3 years |
Debt Instrument Covenant Ratio of Funded Debt to Consolidated EBIDTA | 2.5 mlab_DebtInstrumentCovenantRatioOfFundedDebtToConsolidatedEBITDA / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |
Revolving Credit Facility [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) |  | 20,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Repayments of Lines of Credit (in Dollars) | 500,000 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Letter of Credit [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) |  | 1,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |
Term Loan [Member] |  |  |
Note 6 - Long-Term Debt (Details) [Line Items] |  |  |
Long-term Debt, Gross (in Dollars) |  |  | 15,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = mlab_TermLoanMember
Line of Credit Facility, Periodic Payment, Number of Quarterly Payments | 11 mlab_LineOfCreditFacilityPeriodicPaymentNumberOfQuarterlyPayments / us-gaap_CreditFacilityAxis = mlab_TermLoanMember |  |
Line of Credit Facility, Periodic Payment, Principal (in Dollars) | 750,000 us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal / us-gaap_CreditFacilityAxis = mlab_TermLoanMember |  |
Repayments of Long-term Debt (in Dollars) | 750,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_CreditFacilityAxis = mlab_TermLoanMember |  |

X
- Definition The percentage points added to the reference rate used to calculate commercial bank floating rate (CBFR). + References No definition available. + Details
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- Definition Represents the fixed charge coverage ratio required to be maintained by the entity under the terms of debt arrangement. + References No definition available. + Details
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- Definition Represents the ratio of funded debt to EBITDA, required to be maintained under the terms of debt arrangements. + References No definition available. + Details
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- Definition The number of quarterly periodic payments on a line of credit facility. + References No definition available. + Details
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- Definition Represents the high end of the defined tiers of ratio of funded debt to EBITDA used to determine applicable interest rate adjustments and unused capacity fees. + References No definition available. + Details
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- Definition Represents the low end of the defined tiers of ratio of funded debt to EBITDA used to determine applicable interest rate adjustments and unused capacity fees. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the required periodic payment applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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