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Document and Entity Information
 9 Months Ended
Feb. 29, 2012
Apr. 16, 2012
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Feb. 29, 2012  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3  
Entity Registrant Name BIOMERICA INC.  
Entity Central Index Key 0000073290  
Current Fiscal Year End Date --05-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   6,918,339
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes