Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Revenues	$ 1,700	$ 750
Gain (Loss), Foreign Currency Transaction, before Tax	1	3
Research and Development Expense	6,790	5,591
Accounts Receivable, Allowance for Credit Loss, Current	0	0
Inventory Valuation Reserves	296	333
Impairment, Long-Lived Asset, Held-for-Use	0	0
Treasury Stock, Value, Acquired, Cost Method	$ 0	$ 119
Furniture, Fixtures, Equipment, and Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Purchased Software [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years