Note 10 - Equity Compensation - Stock Options (Details) - USD ($)	9 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2015
Outstanding (in shares)	2,976,490	2,677,436	2,677,436
Outstanding (in dollars per share)	$ 8.97	$ 8.85	$ 8.85
Outstanding (Year)	7 years 146 days	6 years 292 days	6 years 219 days	6 years 36 days
Outstanding	$ 4,546,991	$ 10,448,456	$ 8,338,974	$ 4,914,601
Granted (in shares)	1,256,623	1,026,800
Granted (in dollars per share)	$ 10.67	$ 9.39
Forfeitures (in shares)	(161,812)	(150,800)
Forfeitures (in dollars per share)	$ 16.17	$ 15.73
Exercised (in shares)	(440,146)	(509,871)
Exercised (in dollars per share)	$ 7.39	$ 7.33
Outstanding (in shares)	3,631,155	3,043,565	2,976,490	2,677,436
Outstanding (in dollars per share)	$ 9.43	$ 8.95	$ 8.97	$ 8.85
Exercisable (in shares)	1,423,528	1,362,810
Exercisable (in dollars per share)	$ 8.99	$ 9.67
Exercisable (Year)	5 years 109 days	4 years 109 days
Exercisable	$ 2,912,714	$ 4,741,694