Note 11 - Stock-based Compensation - Stock Option Activity Summary (Details) shares in Thousands	3 Months Ended
	Sep. 30, 2022 $ / shares shares
Outstanding (in shares) | shares	1,029
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.35
Granted (in shares) | shares	155
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.44
Exercised (in shares) | shares	0
Exercised, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0
Canceled or expired (in shares) | shares	(72)
Canceled or expired, weighted average grant date fair value (in dollars per share) | $ / shares	$ 5.81
Outstanding (in shares) | shares	1,112
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0.93