Note 6 - Interest Expense - Interest Expense Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Amortization of prepaid financing costs	$ 12	$ 21
Other interest expense	0	4
Interest Expense	52	128
Senior Notes [Member]
Interest Expense, Long-Term Debt	$ 40	$ 103