Note 6 - Net Loss Per Share (Details Textual)	6 Months Ended
	Dec. 31, 2022 $ / shares shares
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) | $ / shares	$ 13.20
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) | $ / shares	$ 175.50
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	0
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	37,032