v3.26.3
Note A - Organization and Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
 12 Months Ended
May 11, 2026
USD ($)
Oct. 15, 2025
USD ($)
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation     $ 7,474 $ 12,325 $ 11,981
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation     7,474 12,325  
Asset, Impairment Loss     10,409 0  
Asset, Held-for-Sale, Not Part of Disposal Group     4,000    
Contract with Customer, Refund Liability     0    
Sales, Royalty and Licensing Revenue     7,900 8,100  
Royalty Expense     200 300  
Research and Development Expense     2,300 1,800  
Advertising Expense     600 400  
Deferred Tax Assets, Gross     14,573 14,347  
Deferred Tax Assets, Valuation Allowance     $ 10,395 $ 4,814  
Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Number of Major Customers     2 3  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Beta-alanine Raw Material [Member]          
Concentration Risk, Percentage     9.20% 6.80%  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Largest Customers [Member]          
Concentration Risk, Percentage     59.40%    
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]          
Concentration Risk, Percentage       67.80%  
Restricted Stock [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares     158,538 222,551  
Income Tax Jurisdiction, Domestic Federal [Member]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ 5,600    
Deferred Tax Assets, Gross     10,400    
Deferred Tax Assets, Valuation Allowance     10,400    
Deferred Tax Assets, Net of Valuation Allowance     $ 0    
Designated as Hedging Instrument [Member]          
Derivative, Gain (Loss) on Derivative, Net $ (200)        
Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)     1 year    
Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year)     39 years    
Fair Value, Inputs, Level 1 [Member]          
Fair Value, Net Asset (Liability)     $ 0 $ 0  
Fair Value, Inputs, Level 2 [Member]          
Fair Value, Net Asset (Liability)       (1,599)  
Derivative, Fair Value, Net     0    
Fair Value, Inputs, Level 2 [Member] | Line of Credit [Member]          
Debt Instrument, Fair Value Disclosure     7,700 1,900  
Fair Value, Inputs, Level 2 [Member] | Term Loan [Member]          
Debt Instrument, Fair Value Disclosure     10,900 8,900  
Fair Value, Inputs, Level 3 [Member]          
Fair Value, Net Asset (Liability)       $ 0  
Natural Alternatives International Europe SA [Member]          
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation     $ 6,300    
Dividends and Interest Paid   $ 3,100      
Withholding Tax Percentage   5.00%