Note F - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Federal, State and Local Income Tax Expense (Benefit), Gross, Continuing Operations	$ 2,200,000	$ 3,600,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 0	193,000
Federal, State and Local Income Tax Expense Benefit, Continuing Operations		$ 3,400,000
Effective Income Tax Rate Reconciliation, Percent	28.40%	29.70%
Net Income (Loss) Attributable to Parent	$ 7,235,000	$ 9,546,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%
Natural Alternatives International Europe SA [Member]
Net Income (Loss) Attributable to Parent	$ 3,100,000
Undistributed Earnings of Foreign Subsidiaries	20,900,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 4,100,000
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year	2008
Domestic Tax Authority [Member] | Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2014
Foreign Tax Authority [Member] | Natural Alternatives International Europe SA [Member]
Effective Income Tax Rate Reconciliation, Percent	17.50%
Foreign Tax Authority [Member] | Earliest Tax Year [Member] | Swiss Federal Tax Administration (FTA) [Member]
Open Tax Year	2015