Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Jun. 30, 2012 Year	Jun. 30, 2011
Income Taxes [Line Items]
Ownership change percentage that limits operating loss carry forwards	50.00%
Testing period for ownership change	3
Net income	$ 4,158,000	$ 5,086,000
Statutory federal income tax rate applied in the computation of income tax benefit	34.00%	34.00%
Natural Alternatives International Europe Sa
Income Taxes [Line Items]
Effective tax rate	18.63%
Net income	1,600,000
Undistributed earnings	10,100,000
State and Local Jurisdiction
Income Taxes [Line Items]
State tax net operating loss carry forward	$ 8,900,000
State and Local Jurisdiction | Minimum
Income Taxes [Line Items]
Tax loss carry forward expiry year	2019