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Document And Entity Information - USD ($)
12 Months Ended
Jun. 30, 2015
Aug. 24, 2015
Dec. 31, 2014
Common Class B [Member]      
Entity Common Stock, Shares Outstanding (in shares)   782,169  
Common Class A [Member]      
Entity Common Stock, Shares Outstanding (in shares)   6,230,772  
Entity Registrant Name STARRETT L S CO    
Entity Central Index Key 0000093676    
Current Fiscal Year End Date --06-30    
Entity Filer Category Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 122,614,044
Document Type 10-K    
Document Period End Date Jun. 30, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Amendment Flag false