Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Revenues, Total	$ 869	$ 334
Number of Countries in which Entity Operates	11	10
Foreign Currency Transaction Gain (Loss), before Tax, Total	$ (13)	$ 3
Research and Development Expense, Total	2,781	2,692
Accounts Receivable, Allowance for Credit Loss, Current	$ 0	0
Property, Plant and Equipment, Useful Life (Year)	5 years
Impairment, Long-Lived Asset, Held-for-Use, Total	$ 0
Impairment of Long-Lived Assets to be Disposed of	$ 0	$ 173
Purchased Software [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years