Note 4 - Summary of Stock Option Activity (Details) - The 2012 Stock Incentive Plan [Member] - $ / shares	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Balance (in shares)	63,915	54,307	75,388
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	55,766	52,836	35,208
Options granted (in dollars per share)	$ 7.88	$ 9.37	$ 13.97
Shares Available for Grant (in shares)	(55,766)	(52,836)	(35,208)
Options exercised (in shares)	(10,893)	(15,523)	(30,718)
Options exercised (in dollars per share)	$ 8.34	$ 9.57	$ 8.82
Options canceled (in shares)	(31,503)	(27,705)	(25,571)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	31,503	27,705	25,571
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	63,915	54,307	75,388
Balance (in shares)	77,285	63,915	54,307
Shares Available for Grant (in shares)	346,600
Shares Available For Grant [Member]
Shares Available for Grant (in shares)	389,844	414,975	424,612
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	55,766	52,836	35,208
Shares Available for Grant (in shares)	(55,766)	(52,836)	(35,208)
Options canceled (in shares)	(31,503)	(27,705)	(25,571)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	31,503	27,705	25,571
Shares Available for Grant (in shares)	365,581	389,844	414,975