Note 7 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense	$ 1,017,700	$ 0	$ 1,017,700	$ 99,500
General and Administrative Expense [Member]
Change in fair value from modification of warrant terms			25,506
Allocated Share-based Compensation Expense	816,050		850,331	92,000
General and Administrative Expense [Member] | Share-based Payment Arrangement, Option [Member]
Change in fair value from modification of option terms			8,775
Allocated Share-based Compensation Expense	816,050		816,050	92,000
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	201,650		201,650	7,500
Research and Development Expense [Member] | Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense	$ 201,650		$ 201,650	$ 7,500