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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)		1 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended
	Oct. 15, 2014	Nov. 30, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				$ (905,000)	$ (5,076,000)
Business Combination, Subsequent Adjustment to Initial Contingent Consideration Liability				$ 300,000
PCD [Member]
Business Acquisition, Earn Out Period for Determination of Contingent Consideration	3 years
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	$ 0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	1,500,000
Business Combination, Contingent Consideration, Liability	300,000
Business Combination, Payment of Contingent Consideration		$ 450,000					$ 150,000
PCD [Member] | Other Expense, Net [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability						$ 450,000
Business Combination, Subsequent Adjustment to Initial Contingent Consideration Liability			$ 300,000
PCD [Member] | Minimum [Member]
Business Acquisition, Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration	9,900,000
PCD [Member] | Maximum [Member]
Business Acquisition, Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration	$ 12,600,000

X

- Definition

Represents the earn-out period over which the revenue growth will be assessed to determine the contingent consideration payable.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlab_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the cumulative revenue required based upon a sliding scale of three years subsequent to the acquisition for payment of contingent consideration.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlab_
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X

- Definition

Amount of contingent consideration paid by the acquirer.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of adjustment to the initial contingent consideration liability recorded upon the commencement of a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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X

- Definition

For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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X

- Details

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- Details

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- Details

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