Note 7 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense	$ 236,100	$ 1,369,350
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	535,943	1,198,575
Change in fair value from modification of warrant terms	118,233	163,956
General and Administrative Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense		8,723
General and Administrative Expense [Member] | Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense	206,525	782,135
Change in fair value from modification of option terms	211,185	243,761
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	85,483	841,104
Change in fair value from modification of warrant terms	44,793	132,896
Research and Development Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense		15,098
Research and Development Expense [Member] | Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense	29,575	587,215
Change in fair value from modification of option terms	$ 11,115	$ 105,895