Note 6 - Interest Expense - Interest Expense Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Amortization of prepaid financing costs	$ 21	$ 42
Interest on financed lease obligations	0	2
Other interest expense	4	23
Interest Expense	128	256
Senior Notes [Member]
Interest Expense, Long-Term Debt	103	170
Paycheck Protection Program CARES Act [Member]
Interest Expense, Long-Term Debt	$ 0	$ 19