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Note 2 - Acquisitions Dispositions (Details) - Purchase Price Allocation - BGI (USD $)
Dec. 31, 2014
Mar. 31, 2014
Apr. 15, 2014
Note 2 - Acquisitions Dispositions (Details) - Purchase Price Allocation - BGI [Line Items]      
Goodwill $ 44,097,000us-gaap_Goodwill $ 37,866,000us-gaap_Goodwill  
BGI [Member]      
Note 2 - Acquisitions Dispositions (Details) - Purchase Price Allocation - BGI [Line Items]      
Inventories, net     1,268,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= mlab_BGIMember
Property, plant and equipment, net     47,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mlab_BGIMember
Intangibles, net     5,711,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mlab_BGIMember
Goodwill     3,295,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mlab_BGIMember
Accrued expenses     (53,000)mlab_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= mlab_BGIMember
Total purchase price allocation     $ 10,268,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mlab_BGIMember