Note 3 - Summary of Significant Accounting Policies - Outstanding Dilutive Securities (Details) - shares	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Antidilutive securities (in shares)	927,797	3,516,650
Series A-1 Preferred Stock [Member]
Antidilutive securities (in shares)	0	1,960,600
Series A-2 Preferred Stock [Member]
Antidilutive securities (in shares)	0	335,711
Series B Preferred Stock [Member]
Antidilutive securities (in shares)	0	1,034,890
Warrant [Member]
Antidilutive securities (in shares)	598,457	43,618
Share-Based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	329,340	141,831