Note A - Organization and Summary of Significant Accounting Policies (Details Textual) € in Millions, SFr in Millions	12 Months Ended
	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2021 EUR (€)	Jun. 30, 2021 CHF (SFr)
Contract with Customer, Liability, Current	$ 1,721,000	$ 62,000
Asset Impairment Charges, Total	21,000	0
Sales, Royalty and Licensing Revenue	14,200,000	12,600,000
Royalty Expense	600,000	500,000
Research and Development Expense, Total	1,900,000	1,800,000
Advertising Expense	800,000	1,400,000
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	$ 14,000,000	$ 13,400,000
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	2	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Beta-alanine Raw Material [Member]
Concentration Risk, Percentage	8.60%	2.50%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Largest Customers [Member]
Concentration Risk, Percentage	64.80%	65.70%
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	22,500	130,000
Restricted Stock 1 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	52,108	323,904
Juice Plus + [Member]
Sales Discounts, Cash	$ 1,600,000	$ 1,600,000
Kaged Muscle LLC [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	$ 3,500,000	3,300,000
Allowance for Doubtful Accounts Receivable, Percentage of Outstanding Balance	100.00%		100.00%	100.00%
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount	$ 6,200,000			SFr 5.5
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	$ 60,400,000		€ 51.3
Maximum Remaining Maturity of Foreign Currency Derivatives (Month)	1 year 60 days
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 2 [Member]
Foreign Currency Contracts, Liability, Fair Value Disclosure	800,000
Foreign Currency Contract, Asset, Fair Value Disclosure		300,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Net Asset (Liability), Total	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares) | shares	0