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Note A - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)
€ in Millions, SFr in Millions
 12 Months Ended
Aug. 18, 2021
USD ($)
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2025
EUR (€)
Jun. 30, 2025
CHF (SFr)
Aug. 23, 2021
Asset Impairment Charges   $ 0        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]          
Derivative, Fixed Interest Rate           2.40%
Contract with Customer, Refund Liability   11,000        
Sales, Royalty and Licensing Revenue   8,100,000 $ 8,400,000      
Royalty Expense   300,000 300,000      
Research and Development Expense   1,800,000 1,900,000      
Advertising Expense   400,000 300,000      
Deferred Tax Assets, Valuation Allowance   4,814,000 (0)      
Deferred Tax Assets, Gross   $ 14,347,000 $ 12,563,000      
Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Number of Major Customers   3        
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Beta-alanine Raw Material [Member]            
Concentration Risk, Percentage   6.80% 4.40%      
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]            
Concentration Risk, Percentage   67.80% 72.60%      
Restricted Stock [Member]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares   222,551 232,574      
Domestic Tax Jurisdiction [Member]            
Deferred Tax Assets, Valuation Allowance   $ 4,800,000        
Deferred Tax Assets, Gross   4,800,000        
Deferred Tax Assets, Net of Valuation Allowance   0        
Foreign Exchange Contract Euro Sales [Member] | Cash Flow Hedging [Member]            
Derivative, Notional Amount   35,500,000   € 31.2    
Foreign Exchange Contract Swiss Franc Sales [Member] | Cash Flow Hedging [Member]            
Derivative, Notional Amount   6,800,000     SFr 5.4  
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]            
Derivative, Notional Amount   $ 11,800,000     SFr 9.5  
Maximum Remaining Maturity of Foreign Currency Derivatives (Year)   11 years        
Minimum [Member]            
Property, Plant and Equipment, Useful Life (Year)   1 year   1 year 1 year  
Maximum [Member]            
Property, Plant and Equipment, Useful Life (Year)   39 years   39 years 39 years  
Term Loan [Member] | Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member]            
Debt Instrument, Face Amount $ 10,000,000          
Debt Instrument, Basis Spread on Variable Rate 1.80%          
Fair Value, Inputs, Level 1 [Member]            
Fair Value, Net Asset (Liability)   $ 0 $ 0      
Fair Value, Inputs, Level 2 [Member]            
Fair Value, Net Asset (Liability)   (1,599,000) 590,000      
Fair Value, Inputs, Level 2 [Member] | Line of Credit [Member]            
Debt Instrument, Fair Value Disclosure   1,900,000 3,400,000      
Fair Value, Inputs, Level 2 [Member] | Term Loan [Member]            
Debt Instrument, Fair Value Disclosure   8,900,000 9,200,000      
Fair Value, Inputs, Level 3 [Member]            
Fair Value, Net Asset (Liability)   $ 0 $ 0