Note 9 - Equity Compensation - Stock Options (Details) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Forfeitures (in dollars per share)	$ 12.46	$ 15.15	$ 10.26
Exercised (in shares)	(486,446)	(561,946)	(163,076)
Exercised (in dollars per share)	$ 7.37	$ 7.34	$ 6.70
Outstanding (in shares)	3,119,688	2,976,490	2,677,436	2,677,464
Exercisable (in shares)	1,277,561	1,312,985	1,597,238
Exercisable (in dollars per share)	$ 8.75	$ 9.75	$ 10.18
Exercisable (Year)	5 years	4 years	4 years 109 days
Exercisable	$ 1,592,653	$ 3,819,127	$ 2,250,093
Outstanding (in shares)	2,976,490	2,677,436	2,677,464
Outstanding (in dollars per share)	$ 8.97	$ 8.85	$ 9.57
Outstanding (Year)	7 years 146 days	6 years 219 days	6 years 36 days	5 years 146 days
Outstanding	$ 2,332,324	$ 8,338,974	$ 4,914,601	$ 1,674,010
Granted (in shares)	1,332,623	1,026,800	734,323
Granted (in dollars per share)	$ 10.59	$ 9.39	$ 6.83
Forfeitures (in shares)	(702,979)	(165,800)	(571,275)
Outstanding (in dollars per share)	$ 9.12	$ 8.97	$ 8.85	$ 9.57