Note 10 - Equity Compensation - Stock Options (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Outstanding (in shares)	3,119,688	2,976,490	2,976,490
Outstanding (in dollars per share)	$ 9.12	$ 8.97	$ 8.97
Outstanding (Year)	7 years 219 days	7 years 109 days	7 years 146 days	6 years 219 days
Outstanding	$ 646,326	$ 8,783,980	$ 2,332,224	$ 8,338,974
Granted (in shares)	724,037	832,500
Granted (in dollars per share)	$ 5.92	$ 11.06
Forfeitures (in shares)	(232,171)	(140,250)
Forfeitures (in dollars per share)	$ 13.92	$ 15.95
Exercised (in shares)	(18,189)	(20,813)
Exercised (in dollars per share)	$ 6.31	$ 8.32
Outstanding (in shares)	3,593,365	3,647,927	3,119,688	2,976,490
Outstanding (in dollars per share)	$ 8.18	$ 9.18	$ 9.12	$ 8.97
Exercisable (in shares)	1,536,124	1,586,188
Exercisable (in dollars per share)	$ 8.26	$ 8.91
Exercisable (Year)	9 years 300 days	5 years 36 days
Exercisable	$ 111,768	$ 4.982876