Note 8 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense		$ 95,500
General and Administrative Expense [Member]
Change in fair value from modification of warrant terms		118,233
Allocated Share-based Compensation Expense		399,043
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		69,625
Research and Development Expense [Member]
Change in fair value from modification of warrant terms		44,793
Allocated Share-based Compensation Expense		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		$ 25,875