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Document And Entity Information - USD ($)
 12 Months Ended
May 31, 2018
Aug. 29, 2018
Nov. 30, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name BIOMERICA INC.    
Document Type 10-K    
Current Fiscal Year End Date --05-31    
Entity Common Stock, Shares Outstanding   8,953,832  
Entity Public Float     $ 22,351,833
Amendment Flag false    
Entity Central Index Key 0000073290    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Smaller Reporting Company    
Entity Well-known Seasoned Issuer No    
Document Period End Date May 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY