Note 7 - Stockholders' Equity - Stock Options Activity (Details) - USD ($)	9 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Outstanding, beginning balance (in shares)	4,225,537
Outstanding, weighted-average exercise price, beginning balance (in dollars per share)	$ 1.79
Outstanding, weighted-average remaining contractual life (Year)	3 years 73 days		4 years 36 days
Outstanding, aggregate intrinsic value	$ 216,875		$ 158,675
Granted, options (in shares)	294,500	100,000
Granted, weighted-average exercise price (in dollars per share)	$ 0.97
Outstanding, ending balance (in shares)	4,520,037		4,225,537
Outstanding, weighted-average exercise price, ending balance (in dollars per share)	$ 1.42		$ 1.79
Exercisable, options (in shares)	4,470,037
Exercisable, weighted-average exercise price (in dollars per share)	$ 1.43
Exercisable, weighted-average remaining contractual life (Year)	3 years 73 days
Exercisable, aggregate intrinsic value	$ 216,875