Note 5 - Long-term Debt (Details Textual) $ in Millions		1 Months Ended
Mar. 01, 2017 USD ($)	Jul. 30, 2018 USD ($)
Credit Facility [Member]
Debt Instrument Convenant, Maximum Leverage Ration, During the Initial Holiday Period	3.5
Debt Instrument Covenant, Maximum Leverage Ratio, Immediately Following the Initial Holiday Period	3.25
Debt Instrument Covenant, Fixed Charge Coverage Ratio	1.25
Credit Facility [Member] \| Subsequent Event [Member]
Repayments of Lines of Credit		$ 1.0
Credit Facility [Member] \| After March 31, 2016 [Member]
Debt Instrument Covenant, Ratio of Funded Debt to Consolidated EBITDA	3
Credit Facility [Member] \| Term Loan [Member]
Long-term Debt, Gross	$ 20.0
Line of Credit [Member]
Long-term Debt, Gross	$ 20.0
Line of Credit [Member] \| Debt Instrument, Variable Rate Base CBFR Using One Month LIBOR [Member]
Debt Instrument, Basis Spread on Variable Rate Used to Calculate Commercial Bank Floating Rate	0.50%
Line of Credit [Member] \| Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.15%
Line of Credit [Member] \| Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Line of Credit [Member] \| Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
Line of Credit [Member] \| Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Line of Credit [Member] \| Credit Facility [Member]
Debt Instrument, Term	5 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 80.0
Line of Credit Facility, Additional Maximum Borrowing Capacity	100.0
Letter of Credit [Member] \| Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2.5

The percentage points added to the reference rate used to calculate commercial bank floating rate (CBFR).

No definition available.

Name:	mlab_DebtInstrumentBasisSpreadOnVariableRateUsedToCalculateCommercialBankFloatingRate
Namespace Prefix:	mlab_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the maximum leverage ratio required to be maintained by the entity during the Initial Holiday Period.

+ References

No definition available.

+ Details

Name:	mlab_DebtInstrumentConvenantMaximumLeverageRationDuringTheInitialHolidayPeriod
Namespace Prefix:	mlab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	mlab_DebtInstrumentCovenantFixedChargeCoverageRatio
Namespace Prefix:	mlab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the maximum leverage ratio required to be maintained by the entity immediately following the Initial Holiday Period.

+ References

No definition available.

+ Details

Name:	mlab_DebtInstrumentCovenantMaximumLeverageRatioImmediatelyFollowingTheInitialHolidayPeriod
Namespace Prefix:	mlab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the ratio of funded debt to EBITDA, required to be maintained under the terms of debt arrangements.

+ References

No definition available.

+ Details

Name:	mlab_DebtInstrumentCovenantRatioOfFundedDebtToConsolidatedEBITDA
Namespace Prefix:	mlab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The additional maximum borrowing capacity under the credit facility provided the application of a posting-closing accordion feature.

+ References

No definition available.

+ Details

Name:	mlab_LineOfCreditFacilityAdditionalMaximumBorrowingCapacity
Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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 4: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=mlab_CreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=mlab_AfterMarch312016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=mlab_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=mlab_DebtInstrumentVariableRateBaseCBFRUsingOneMonthLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: