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Note F - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Federal, State and Local Income Tax Expense (Benefit), Gross, Continuing Operations   $ 4,400,000 $ 2,200,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 212,000  
Effective Income Tax Rate Reconciliation, Percent, Total   52.40% 28.40%
Net Income (Loss) Attributable to Parent, Total   $ 5,051,000 $ 7,235,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   28.06% 34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Transition Tax Liability   $ 1,700,000  
Undistributed Earnings of Foreign Subsidiaries   0  
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount   1,100,000  
Scenario, Forecast [Member]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
Natural Alternatives International Europe SA [Member]      
Net Income (Loss) Attributable to Parent, Total   6,000,000  
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards, Total   $ 3,400,000  
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]      
Open Tax Year   2007  
Domestic Tax Authority [Member] | Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]      
Open Tax Year   2015  
Foreign Tax Authority [Member] | Natural Alternatives International Europe SA [Member]      
Effective Income Tax Rate Reconciliation, Percent, Total   20.20%  
Foreign Tax Authority [Member] | Earliest Tax Year [Member] | Swiss Federal Tax Administration (FTA) [Member]      
Open Tax Year   2015