Document and Entity Information (USD $)	12 Months Ended
	Jun. 30, 2012	Sep. 21, 2012	Dec. 31, 2011
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	NAII
Entity Registrant Name	NATURAL ALTERNATIVES INTERNATIONAL INC
Entity Central Index Key	0000787253
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		6,950,687
Entity Public Float			$ 49,354,082