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Note 9 - Stock-Based Compensation (Details) - Allocation of Share-Based Compensation (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allocation of Share-Based Compensation [Abstract]
Total cost of stock based compensation charged against income before income tax	$ 993us-gaap_AllocatedShareBasedCompensationExpense	$ 840us-gaap_AllocatedShareBasedCompensationExpense	$ 1,112us-gaap_AllocatedShareBasedCompensationExpense
Amount of income tax benefit recognized in earnings	373us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	263us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	388us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Amount charged against net income	$ 620us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	$ 577us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	$ 724us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Impact on net income per common share:
Basic (in Dollars per share)	$ 0.18mlab_ShareBasedCompensationEffectOnEarningPerShareBasic	$ 0.17mlab_ShareBasedCompensationEffectOnEarningPerShareBasic	$ 0.22mlab_ShareBasedCompensationEffectOnEarningPerShareBasic
Diluted (in Dollars per share)	$ 0.17mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted	$ 0.16mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted	$ 0.20mlab_ShareBasedCompensationEffectOnEarningPerShareDiluted

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- Definition

Represents the impact of share-based compensation in basic earning per share computations.

+ References

No definition available.

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- Definition

Represents the impact of share-based compensation in diluted earning per share computations.

+ References

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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