Document And Entity Information (USD $)	12 Months Ended
	May 31, 2013	Aug. 29, 2013	Nov. 30, 2012
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		7,276,714
Entity Public Float			$ 4,516,803
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, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY