Document And Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2023	Sep. 19, 2023	Dec. 31, 2022
Document Information [Line Items]
Entity Central Index Key	0000787253
Entity Registrant Name	NATURAL ALTERNATIVES INTERNATIONAL INC
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	000-15701
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-1007839
Entity Address, Address Line One	1535 Faraday Ave
Entity Address, City or Town	Carlsbad
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92008
City Area Code	760
Local Phone Number	736-7700
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	NAII
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 Emerging Growth Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Document Financial Statement Error Correction [Flag]	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 50,460,000
Entity Common Stock, Shares Outstanding		6,088,813
Auditor Name	HASKELL & WHITE LLP
Auditor Firm ID	200
Auditor Location	Irvine, California