Note 8 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Employee Stock Option [Member]
Allocated Share-based Compensation Expense	$ 1,269,700	$ 6,134	$ 1,369,350	$ 135,950
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	691,076	6,134	1,198,575	285,560
Change in fair value from modification of warrant terms	7,091		163,956
General and Administrative Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense	1,500		8,723	6,830
General and Administrative Expense [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense	682,485	6,134	782,135	112,699
Change in fair value from modification of option terms			243,761	166,031
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	587,434		841,104	42,645
Change in fair value from modification of warrant terms	219		132,896
Research and Development Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense			15,098	7,954
Research and Development Expense [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense	587,215		587,215	23,251
Change in fair value from modification of option terms			$ 105,895	$ 11,440