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Cover - USD ($)
 12 Months Ended
May 31, 2023
Aug. 25, 2023
Nov. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date May 31, 2023    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Current Fiscal Year End Date --05-31    
Entity File Number 001-37863    
Entity Registrant Name BIOMERICA, INC.    
Entity Central Index Key 0000073290    
Entity Tax Identification Number 95-2645573    
Entity Incorporation, State or Country Code DE    
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    
Trading Symbol BMRA    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 42,738,451
Entity Common Stock, Shares Outstanding   16,821,646  
Documents Incorporated by Reference [Text Block] Portions of the registrant’s definitive Proxy Statement on Schedule 14A relating to the registrant’s 2023 annual meeting of stockholders, to be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, are incorporated by reference in Part III, Items 10 through 14 of this Annual Report on Form 10-K. Except for the portions of the Proxy Statement specifically incorporated by reference in this Form 10-K, the Proxy Statement and related proxy solicitation materials shall not be deemed to be filed as part hereof.    
ICFR Auditor Attestation Flag false    
Auditor Firm ID 200    
Auditor Name HASKELL & WHITE LLP    
Auditor Location Irvine, California