Note 7 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense	$ 1,107,700	$ 429,200
General and Administrative Expense [Member]
Change in fair value from modification of warrant terms	25,506	1,064,503
Allocated Share-based Compensation Expense	850,331	1,931,051
General and Administrative Expense [Member] | Share-based Payment Arrangement, Option [Member]
Change in fair value from modification of option terms	8,775	511,448
Allocated Share-based Compensation Expense	816,050	355,100
Research and Development Expense [Member]
Change in fair value from modification of warrant terms		457,273
Allocated Share-based Compensation Expense	201,650	645,983
Research and Development Expense [Member] | Share-based Payment Arrangement, Option [Member]
Change in fair value from modification of option terms		114,610
Allocated Share-based Compensation Expense	$ 201,650	$ 74,100