Note 10 - Equity Compensation - Summary of Unvested Stock Options (Details) - $ / shares	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Unvested (in shares)	1,842,127
Unvested (in dollars per share)	$ 3.52
Granted (in shares)	794,537	1,256,623
Granted (in dollars per share)	$ 1.73	$ 3.71
Vested (in shares)	(640,984)
Vested (in dollars per share)	$ 3.51
Forfeited (in shares)	(204,884)
Forfeited (in dollars per share)	$ 3.46
Unvested (in shares)	1,790,796
Unvested (in dollars per share)	$ 2.73