Note 9 - Equity Compensation - Summary of Unvested Stock Options (Details) - $ / shares	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Unvested (in shares)	1,663,505
Unvested (in dollars per share)	$ 3.39
Granted (in shares)	1,332,623	1,026,800	734,323
Granted (in dollars per share)	$ 3.67	$ 3.64	$ 3.27
Vested (in shares)	(696,501)
Vested (in dollars per share)	$ 3.30
Forfeited (in shares)	(457,500)
Forfeited (in dollars per share)	$ 3.81
Unvested (in shares)	1,842,127	1,663,505
Unvested (in dollars per share)	$ 3.52	$ 3.39