Note 7 - Stockholders' Equity - Nonvested Share Activity (Details) - $ / shares	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Nonvested (in shares)	50,000
Nonvested, weighted-average grant-date fair value (in dollars per share)	$ 0.76
Granted, options (in shares)	35,000	0
Granted, weighted-average grant-date fair value (in dollars per share)	$ 0.45
Vested (in shares)	(35,000)
Vested, weighted-average grant-date fair value (in dollars per share)	$ (0.45)
Nonvested (in shares)	50,000
Nonvested, weighted-average grant-date fair value (in dollars per share)	$ 0.76