Note 11 - Stock-based Compensation - Stock Options Outstanding (Details) shares in Thousands	3 Months Ended
	Sep. 30, 2022 $ / shares shares
Outstanding, exercise prices range lower limit (in dollars per share)	$ 0.44
Number outstanding (in shares) | shares	1,112
Outstanding, exercise prices range upper (in dollars per share)	$ 5.85
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	9 years 3 months
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0.93
Shares Exercisable (in shares) | shares	77
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.18
Exercise Price Range 1 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	$ 0.44
Number outstanding (in shares) | shares	1,031
Outstanding, exercise prices range upper (in dollars per share)	$ 0.64
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	9 years 7 months 6 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0.61
Shares Exercisable (in shares) | shares	0
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 0
Exercise Price Range 2 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	$ 1.85
Number outstanding (in shares) | shares	13
Outstanding, exercise prices range upper (in dollars per share)	$ 2.83
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	5 years 11 months 26 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 2.15
Shares Exercisable (in shares) | shares	10
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 2.08
Exercise Price Range 3 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	$ 5.30
Number outstanding (in shares) | shares	68
Outstanding, exercise prices range upper (in dollars per share)	$ 5.85
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	4 years 7 months 9 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.63
Shares Exercisable (in shares) | shares	68
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.63