Note 12 - Equity Transactions and Stock-based Compensation - Summary of the Company's Stock Option Activity, and Related Information (Details) - $ / shares	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Balance (in shares)	2,870,950	3,072,950
Balance (in dollars per share)	$ 0.40	$ 0.52
Granted (in shares)	200,000
Granted (in dollars per share)	$ 0.24
Exercised (in shares)	(30,000)	0
Exercised (in dollars per share)	$ 0.09	$ 0
Terminated (in shares)	(271,667)	(80,000)
Terminated (in dollars per share)	$ 0.24	$ 0.17
Expired (in shares)	(51,100)	(122,000)
Expired (in dollars per share)	$ 6.82	$ 3.63
Balance (in shares)	2,718,183	2,870,950
Balance (in dollars per share)	$ 0.29	$ 0.40
Exercisable at June 30, 2016 (in shares)	2,506,683	2,383,617
Exercisable at June 30, 2016 (in dollars per share)	$ 0.30	$ 0.46