Note 11 - Stock-based Compensation - Restricted Stock Activity (Details) - Restricted Stock [Member]	9 Months Ended
	Mar. 31, 2023 $ / shares shares
Outstanding (in shares) | shares	75,873
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 39.00
Granted (in shares) | shares	2,150
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 11.83
Vested (in shares) | shares	(17,852)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 60.60
Canceled or expired (in shares) | shares	(55)
Canceled or expired (in dollars per share) | $ / shares	$ 60.60
Outstanding (in shares) | shares	60,116
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 31.52