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Note 15 - Equity Incentive Plans - Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Total stock-based compensation expense	$ 576	$ 2,913
Cost of Sales [Member]
Total stock-based compensation expense	2	2
Research and Development Expense [Member]
Total stock-based compensation expense	11	6
Selling and Marketing Expense [Member]
Total stock-based compensation expense	61	0
General and Administrative Expense [Member]
Total stock-based compensation expense	502	2,365
Net Loss From Discontinued Operations [Member]
Total stock-based compensation expense	$ 0	$ 540