Note A - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($)			3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2017	Aug. 07, 2017	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Weighted Average Number of Shares Outstanding, Diluted, Total				7,394,600		6,909,475	7,119,589	6,860,870
Sales Discounts, Noncash							$ 82,000	$ 653,000
Royalty and Licensing Revenue				$ 3,700,000		$ 6,200,000	13,500,000	16,000,000
Royalty Expense				156,000		215,000	597,000	659,000
Financing Receivable, after Allowance for Credit Loss, Current, Total									$ 1,500,000
Investment Income, Interest				$ 411,000		$ 269,000	$ 1,495,000	$ 823,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				0		0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				0		0	5,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period				0		0	0	5,000
Share-based Payment Arrangement, Expense				$ 400,000		$ 322,000	$ 1,200,000	$ 925,000
Foreign Currency Contract, Asset, Fair Value Disclosure				3,400,000			$ 3,400,000		55,000
Foreign Currency Contracts, Liability, Fair Value Disclosure									$ 55,000
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Beta Alanine Raw Material Sale Customers [Member]
Concentration Risk, Percentage							12.90%		17.30%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]
Concentration Risk, Percentage							78.00%		76.60%
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
Juice Plus + [Member]
Agreement, Term		5 years
Kaged Muscle LLC [Member] | Notes Receivable [Member]
Notes, Loans and Financing Receivable, Term	1 year
Financing Receivable, after Allowance for Credit Loss, Current, Total	$ 1,500,000
Notes, Loans and Financing Receivable, Extension Fee					$ 25,000
Notes, Loans and Financing Receivable, Interest Rate, Stated Percentage	15.00%
Investment Income, Interest				$ 0		$ 56,000	$ 104,000	$ 114,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				175,000		175,000		175,000
Weighted Average Number of Shares Outstanding, Diluted, Total				400,000			400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				175,000		175,000	190,000	175,000
Restricted Stock [Member] | Juice Plus, Amended and Restated Exclusive Manufacturing Agreement [Member]
Treasury Stock, Shares, Acquired				400,000
Restricted Stock [Member] | Juice Plus + [Member]
Stock Issuance Agreement, Shares Agreed to Grant		500,000
Sales, Noncash				$ 408,000			$ 408,000
Sales Discounts, Noncash						$ 245,000	$ 82,000	$ 653,000
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate							0.00%
Reclassification out of Accumulated Other Comprehensive Income [Member] | Forecast [Member]
Cumulative Effect on Retained Earnings, Net of Tax, Total			$ 134,000