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Document And Entity Information - shares
 6 Months Ended
Nov. 30, 2017
Jan. 11, 2018
Document and Entity Information [Abstract]    
Entity Registrant Name BIOMERICA INC.  
Document Type 10-Q  
Current Fiscal Year End Date --05-31  
Entity Common Stock, Shares Outstanding   8,541,048
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 Nov. 30, 2017  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2