Note 10 - Common Stock Incentive, Stock Purchase Plans, and Other Compensation Plans - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Share-Based Payment Arrangement, Expense	$ 1,498	$ 1,535
Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense	1,457	1,503
Research and Development Expense [Member]
Share-Based Payment Arrangement, Expense	$ 41	$ 32