Note 11 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Expected benefit	$ 2,025	$ 1,749
Tax credits	200	166
Change in valuation allowance	(1,838)	(1,511)
Stock-based compensation	(296)	(306)
Prior year true-up	0	(9)
Expiration of net operating loss carryovers	(88)	(89)
Other permanent items	(3)	0
Income tax benefit	$ 0	$ 0