Note 11 - Stock-based Compensation - Stock Options Outstanding (Details)	9 Months Ended
	Mar. 31, 2024 $ / shares shares
Outstanding, exercise prices range lower limit (in dollars per share)	$ 7.47
Outstanding, exercise prices range upper (in dollars per share)	$ 175.5
Number outstanding (in shares) | shares	148,166
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	9 years 18 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 14.51
Shares Exercisable (in shares) | shares	14,159
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 42.91
Exercise Price Range 1 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	7.47
Outstanding, exercise prices range upper (in dollars per share)	$ 19.2
Number outstanding (in shares) | shares	145,541
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	9 years 1 month 24 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 12.03
Shares Exercisable (in shares) | shares	11,534
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 18.12
Exercise Price Range 2 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	55.5
Outstanding, exercise prices range upper (in dollars per share)	$ 84.9
Number outstanding (in shares) | shares	418
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	4 years 7 months 13 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 61.52
Shares Exercisable (in shares) | shares	418
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 61.52
Exercise Price Range 3 [Member]
Outstanding, exercise prices range lower limit (in dollars per share)	159
Outstanding, exercise prices range upper (in dollars per share)	$ 175.5
Number outstanding (in shares) | shares	2,207
Weighted average remaining contractual lifeWeighted average remaining contractual life (Year)	3 years 1 month 9 days
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 168.97
Shares Exercisable (in shares) | shares	2,207
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 168.97