Document And Entity Information (USD $)	9 Months Ended
	Dec. 31, 2011	Feb. 14, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	OPTI INC
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		11,645,903
Entity Public Float		$ 5,543,717
Amendment Flag	true
Amendment Description	Amendment No. 1 to add xbrl submission
Entity Central Index Key	0000899297
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	Dec. 31, 2011
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3