Note 8 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Employee Stock Option [Member]
Allocated Share-based Compensation Expense	$ 1,369,350	$ 152,333
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	1,198,575	310,133
Change in fair value from modification of warrant terms	163,956
General and Administrative Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense	8,723	15,021
General and Administrative Expense [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense	782,135	129,081
Change in fair value from modification of option terms	243,761	166,031
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	841,104	56,776
Change in fair value from modification of warrant terms	132,896
Research and Development Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense	15,098	22,084
Research and Development Expense [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense	587,215	23,252
Change in fair value from modification of option terms	$ 105,895	$ 11,440