Note 10 - Common Stock Incentive, Stock Purchase Plans, and Other Compensation Plans - Stock Options Outstanding (Details) - $ / shares shares in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Outstanding, exercise prices range lower limit (in dollars per share)	$ 0.64	$ 1.85
Outstanding, exercise prices range upper (in dollars per share)	$ 6.00	$ 7.50
Number outstanding (in shares)	1,029
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	8 years 10 months 2 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 1.35
Shares Exercisable (in shares)	149
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.49
Exercise Price Range 1 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	0.64
Outstanding, exercise prices range upper (in dollars per share)	$ 2.83
Number outstanding (in shares)	889
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	9 years 9 months
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 0.66
Shares Exercisable (in shares)	9
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 2.15
Exercise Price Range 2 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	5.30
Outstanding, exercise prices range upper (in dollars per share)	$ 5.85
Number outstanding (in shares)	88
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	4 years 10 months 9 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.55
Shares Exercisable (in shares)	88
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.55
Exercise Price Range 3 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	6.00
Outstanding, exercise prices range upper (in dollars per share)	$ 6.00
Number outstanding (in shares)	52
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	1 month 20 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.00
Shares Exercisable (in shares)	52
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.00