Note 7 - Stockholders' Equity - Nonvested Share Activity (Details) - $ / shares	9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Nonvested (in shares)	50,000
Nonvested, weighted-average grant-date fair value (in dollars per share)	$ 0.76
Granted, options (in shares)	294,500	100,000
Granted, weighted-average grant-date fair value (in dollars per share)	$ 0.52
Vested (in shares)	(294,500)
Vested, weighted-average grant-date fair value (in dollars per share)	$ (0.52)
Nonvested (in shares)	50,000
Nonvested, weighted-average grant-date fair value (in dollars per share)	$ 0.46