Cover - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May 31, 2025	Aug. 29, 2025	Nov. 30, 2024
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	May 31, 2025
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
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			$ 6.4
Entity Common Stock, Shares Outstanding		2,815,410
Documents Incorporated by Reference [Text Block]	Portions of the registrant’s definitive proxy statement relating to its 2025 annual meeting of stockholders are incorporated by reference in Part III this Annual Report on Form 10-K where indicated. The definitive proxy statement will be filed with the U.S. Securities Exchange Commission within 120 days after the end of the fiscal year to which this report relates.
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Listing, Par Value Per Share	$ 0.08
Auditor Firm ID	200
Auditor Opinion [Text Block]	We have audited the accompanying consolidated balance sheets of Biomerica, Inc. (the “Company”) as of May 31, 2025 and 2024, the related consolidated statements of operations and comprehensive loss, shareholders’ equity, and cash flows for each of the years then ended, and the related notes (collectively, the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the consolidated financial position of the Company as of May 31, 2025 and 2024, and the consolidated results of its operations and its cash flows for each of the years then ended, in conformity with U.S. generally accepted accounting principles.
Auditor Name	HASKELL & WHITE LLP
Auditor Location	Irvine, California