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
	Dec. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($) shares	Jun. 30, 2023 EUR (€)	Jun. 30, 2023 CHF (SFr)
Income Tax Return Receivable		$ 3,500,000	$ 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, Total			0
Contract with Customer, Refund Liability		0	0
Sales, Royalty and Licensing Revenue			8,700,000	$ 16,200,000
Royalty Expense			300,000	700,000
Research and Development Expense			2,100,000	2,500,000
Advertising Expense			$ 700,000	$ 1,100,000
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			21.40%	5.40%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]
Concentration Risk, Percentage			47.40%	52.40%
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares			60,497	93,114
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount		12,300,000	$ 12,300,000			SFr 11.1
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount		$ 31,700,000	$ 31,700,000		€ 28.4
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	1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		39 years	39 years		39 years	39 years
Fair Value, Inputs, Level 1 [Member]
Fair Value, Net Asset (Liability), Total		$ 0	$ 0	$ 0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Net Asset (Liability), Total		$ 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