Note 11 - Stock-based Compensation - Stock Option Activity Summary (Details)	6 Months Ended
	Dec. 31, 2022 $ / shares shares
Outstanding (in shares) | shares	34,284
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 40.41
Granted (in shares) | shares	5,162
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 13.20
Exercised (in shares) | shares	0
Exercised, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0
Canceled or expired (in shares) | shares	(2,414)
Canceled or expired, weighted average grant date fair value (in dollars per share) | $ / shares	$ 174.08
Outstanding (in shares) | shares	37,032
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 27.91