Note 10 - Equity Compensation - Summary of Unvested Stock Options (Details) - $ / shares	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Unvested (in shares)	1,842,127
Unvested (in dollars per share)	$ 3.52
Granted (in shares)	794,537	834,320
Granted (in dollars per share)	$ 1.73	$ 3.83
Vested (in shares)	(513,504)
Vested (in dollars per share)	$ 3.49
Forfeited (in shares)	(202,134)
Forfeited (in dollars per share)	$ 3.46
Unvested (in shares)	1,921,026
Unvested (in dollars per share)	$ 2.79