Note A - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	278,107	238,682	278,949	236,155
Contract with Customer, Refund Liability	$ 400,000		$ 400,000
Sales, Royalty and Licensing Revenue	1,800,000	$ 2,200,000	4,300,000	$ 3,900,000
Royalty Expense	$ 62,000	$ 93,000	$ 154,000	$ 182,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	0	0	0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0	0	0	15,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	0	0	0	0
Share-Based Payment Arrangement, Expense	$ 300,000	$ 300,000	$ 600,000	$ 600,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Net Asset (Liability)	768,000		768,000		$ 590,000
Fair Value, Inputs, Level 2 [Member] | Line of Credit [Member]
Debt Instrument, Fair Value Disclosure	5,000,000		5,000,000		3,400,000
Fair Value, Inputs, Level 2 [Member] | Term Loan [Member]
Debt Instrument, Fair Value Disclosure	9,100,000		9,100,000		9,200,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Net Asset (Liability)	$ 0		$ 0		$ 0