Note 7 - Stockholders' Equity - Nonvested Share Activity (Details) - $ / shares	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Nonvested (in shares)	50,000
Nonvested, weighted-average grant-date fair value (in dollars per share)	$ 0.76
Granted, options (in shares)	319,500	100,000
Granted, weighted-average grant-date fair value (in dollars per share)	$ 0.46
Vested (in shares)	(344,500)
Vested, weighted-average grant-date fair value (in dollars per share)	$ (0.50)
Nonvested (in shares)	25,000	50,000
Nonvested, weighted-average grant-date fair value (in dollars per share)	$ 0.46	$ 0.76