Note 10 - Equity Compensation - Summary of Unvested Stock Options (Details) - $ / shares	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Unvested (in shares)	1,842,127
Unvested (in dollars per share)	$ 3.52
Granted (in shares)	724,037	832,500
Granted (in dollars per share)	$ 1.71	$ 3.83
Vested (in shares)	(384,602)
Vested (in dollars per share)	$ 3.58
Forfeited (in shares)	(124,321)
Forfeited (in dollars per share)	$ 3.49
Unvested (in shares)	2,057,241
Unvested (in dollars per share)	$ 2.87