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Document And Entity Information (USD $)
 12 Months Ended
Mar. 31, 2015
May 31, 2015
Sep. 30, 2014
Document and Entity Information [Abstract]      
Entity Registrant Name MESA LABORATORIES INC /CO    
Document Type 10-K    
Current Fiscal Year End Date --03-31    
Entity Common Stock, Shares Outstanding   3,576,678dei_EntityCommonStockSharesOutstanding  
Entity Public Float     $ 149,275,000dei_EntityPublicFloat
Amendment Flag false    
Entity Central Index Key 0000724004    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Mar. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY