Note 7 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense	$ 5,250	$ 1,269,700	$ 123,250	$ 1,369,350
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	5,250	691,076	426,793	1,198,575
Change in fair value from modification of warrant terms		7,091	118,233	163,956
General and Administrative Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense		1,500		8,723
General and Administrative Expense [Member] | Share-based Payment Arrangement, Option [Member]
Allocated Share-based Compensation Expense	5,250	682,485	97,375	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		587,434	81,783	841,104
Change in fair value from modification of warrant terms		219	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		587,215	25,875	587,215
Change in fair value from modification of option terms			$ 11,115	$ 105,895