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Note 8 - Commitments and Contingencies (Details Textual)			3 Months Ended			12 Months Ended
	Oct. 15, 2014 USD ($)	Nov. 06, 2013	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Oct. 15, 2014 CAD
Business Combination, Contingent Consideration, Liability			$ 118,000			$ 116,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			(437,000)		$ 111,000
Business Combination, Subsequent Adjustment to Initial Contingent Consideration Liability			300,000
PCD [Member]
Business Combination, Contingent Consideration, Liability	$ 300,000
Business Combination, Payment of Contingent Consideration				$ 450,000			$ 150,000
Business Acquisition, Earn Out Period for Determination of Contingent Consideration	3 years
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low | CAD								CAD 0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 1,500,000
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
Amega Scientific Corporation [Member]
Business Acquisition, Earn Out Period for Determination of Contingent Consideration		3 years

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_
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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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X

- Definition

Amount of contingent consideration paid by the acquirer.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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_
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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

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- Details

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X

- Details

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