Note A - Organization and Summary of Significant Accounting Policies (Details Textual) € in Millions, SFr in Millions		1 Months Ended	6 Months Ended	12 Months Ended
	Aug. 18, 2021 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2024 EUR (€)	Jun. 30, 2024 CHF (SFr)
Income Tax Return Receivable				$ 3,500,000
Accounts Receivable, Original Amount of Settled Receivable		$ 3,400,000
Accounts Receivable, Amount Settled		$ 1,400,000
Accounts Receivable, Increase (Decrease) in Amount			$ 850,000
Asset Impairment Charges				0	$ 0
Derivative, Fixed Interest Rate	2.40%
Contract with Customer, Refund Liability				0
Sales, Royalty and Licensing Revenue				8,400,000	8,700,000
Royalty Expense				300,000	300,000
Research and Development Expense				1,900,000	2,100,000
Advertising Expense				$ 300,000	$ 700,000
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) [Member]
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				4.40%	21.40%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]
Concentration Risk, Percentage				72.60%	47.40%
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares				232,574	60,497
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount				$ 11,900,000			SFr 10.5
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount				$ 34,000,000		€ 30.8
Maximum Remaining Maturity of Foreign Currency Derivatives (Year)				15 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	$ 0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Net Asset (Liability)			937,000	590,000	937,000
Fair Value, Inputs, Level 2 [Member] | Line of Credit [Member]
Debt Instrument, Fair Value Disclosure			0	3,400,000	0
Fair Value, Inputs, Level 2 [Member] | Term Loan [Member]
Debt Instrument, Fair Value Disclosure			9,500,000	9,200,000	9,500,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Net Asset (Liability)			$ 0	0	$ 0
Cost of Sales [Member]
Income Tax Recovery				2,200,000
Selling, General and Administrative Expenses [Member]
Income Tax Recovery				$ 1,300,000