Note 10 - Equity Compensation - Stock Options (Details) - USD ($)	6 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	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 36 days	6 years 292 days	6 years 219 days	6 years 36 days
Outstanding	$ 4,648,729	$ 12,661,470	$ 8,338,974	$ 4,914,601
Granted (in shares)	834,320	1,016,800
Granted (in dollars per share)	$ 11.05	$ 9.38
Forfeitures (in shares)	(147,375)	(55,050)
Forfeitures (in dollars per share)	$ 16.03	$ 11.65
Exercised (in shares)	(38,063)	(298,724)
Exercised (in dollars per share)	$ 7.75	$ 7.20
Outstanding (in shares)	3,625,372	3,340,462	2,976,490	2,677,436
Outstanding (in dollars per share)	$ 9.18	$ 9.11	$ 8.97	$ 8.85
Exercisable (in shares)	1,700,025	1,628,976
Exercisable (in dollars per share)	$ 8.73	$ 9.95
Exercisable (Year)	5 years 36 days	4 years 182 days
Exercisable	$ 3,216,899	$ 6,032,985