Note A - Organization and Summary of Significant Accounting Policies (Details Textual) € in Millions, SFr in Millions	12 Months Ended
	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2022 EUR (€)	Jun. 30, 2022 CHF (SFr)
Contract with Customer, Liability, Current	$ 140,000	$ 1,721,000
Asset Impairment Charges, Total	0	21,000
Contract with Customer, Refund Liability, Total	13,000
Sales, Royalty and Licensing Revenue	16,200,000	14,200,000
Royalty Expense	700,000	600,000
Research and Development Expense, Total	2,500,000	1,900,000
Advertising Expense	1,100,000	800,000
Effective Income Tax Rate Reconciliation, Global Intangible Low-taxed Income, Amount, Discrete Benefit		(400,000)
Income Tax Benefit Cares Act		300,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount, Additional Expense	100,000
Accounts Receivable, after Allowance for Credit Loss, Total	10,700,000	14,000,000.0
Kaged Muscle LLC [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	$ 3,400,000	$ 3,500,000
Allowance for Doubtful Accounts Receivable, Percentage of Outstanding Balance		100.00%
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	5.40%	8.60%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Largest Customers [Member]
Concentration Risk, Percentage	52.40%	64.80%
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	93,114	22,500
Restricted Stock 1 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares		52,108
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount	$ 5,200,000			SFr 5
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 37,700,000		€ 31.9
Maximum Remaining Maturity of Foreign Currency Derivatives (Month)	14 months
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), Total	$ 0	$ 0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Net Asset (Liability), Total	$ 0	$ 0