Note 7 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Employee Stock Option [Member]
Allocated Share-based Compensation Expense	$ 22,500	$ 97,350	$ 118,000	$ 99,650
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	22,500	501,066	421,543	507,499
Change in fair value from modification of warrant terms		156,865	118,233	156,865
General and Administrative Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense		3,090		7,223
General and Administrative Expense [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense	22,500	97,350	92,125	99,650
Change in fair value from modification of option terms		243,761	211,185	243,761
Research and Development Expense [Member]
Allocated Share-based Compensation Expense		246,643	81,783	253,670
Change in fair value from modification of warrant terms		132,677	44,793	132,677
Research and Development Expense [Member] | Stock Bonus [Member]
Allocated Share-based Compensation Expense		8,071		15,098
Research and Development Expense [Member] | Employee Stock Option [Member]
Allocated Share-based Compensation Expense			25,875
Change in fair value from modification of option terms		$ 105,895	$ 11,115	$ 105,895