Note 8 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense		$ 5,250	$ 99,500	$ 123,250
General and Administrative Expense [Member]
Change in fair value from modification of warrant terms				118,233
Allocated Share-based Compensation Expense		5,250	92,000	426,793
General and Administrative Expense [Member] | Share-based Payment Arrangement, Option [Member]
Change in fair value from modification of option terms				211,185
Allocated Share-based Compensation Expense		5,250	92,000	97,375
Research and Development Expense [Member]
Change in fair value from modification of warrant terms				44,793
Allocated Share-based Compensation Expense			7,500	81,783
Research and Development Expense [Member] | Share-based Payment Arrangement, Option [Member]
Change in fair value from modification of option terms				11,115
Allocated Share-based Compensation Expense			$ 7,500	$ 25,875