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Document And Entity Information - USD ($)
 12 Months Ended
May 31, 2022
Aug. 29, 2022
Nov. 30, 2021
Document Information Line Items      
Entity Registrant Name BIOMERICA, INC.    
Trading Symbol BMRA    
Document Type 10-K    
Current Fiscal Year End Date --05-31    
Entity Common Stock, Shares Outstanding   13,391,901  
Entity Public Float     $ 55,709,903
Amendment Flag false    
Entity Central Index Key 0000073290    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date May 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-37863    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-2645573    
Entity Address, Address Line One 17571 Von Karman Avenue    
Entity Address, City or Town Irvine    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92614    
City Area Code 949    
Local Phone Number 645-2111    
Title of 12(b) Security COMMON STOCK, PAR VALUE $0.08    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Auditor Name HASKELL & WHITE LLP    
Auditor Firm ID 200    
Auditor Location Irvine, California