Note 13 - Equity Transaction and Stock-based Compensation - Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) - $ / shares	1 Months Ended	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2014
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit		$ 0.09
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit		$ 0.10
Outstanding (in shares)		2,176,000
Weighted Average Exercise Price, Outstanding (in dollars per share)		$ 0.09
Weighted Average Remaining Contractual Life		8 years 292 days
Exercisable (in shares)		1,688,667
Weighted Average Exercise Price, Exercisable (in dollars per share)		$ 0.09
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit		0.14
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit		$ 0.15
Outstanding (in shares)		469,750
Weighted Average Exercise Price, Outstanding (in dollars per share)		$ 0.14
Weighted Average Remaining Contractual Life		2 years 182 days
Exercisable (in shares)		469,750
Weighted Average Exercise Price, Exercisable (in dollars per share)		$ 0.14
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit		3.05
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit		$ 3.05
Outstanding (in shares)		169,600
Weighted Average Exercise Price, Outstanding (in dollars per share)		$ 3.05
Weighted Average Remaining Contractual Life		1 year 146 days
Exercisable (in shares)		169,600
Weighted Average Exercise Price, Exercisable (in dollars per share)		$ 3.05
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit		3.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit		$ 3.36
Outstanding (in shares)		4,500
Weighted Average Exercise Price, Outstanding (in dollars per share)		$ 3.36
Weighted Average Remaining Contractual Life		1 year 146 days
Exercisable (in shares)		4,500
Weighted Average Exercise Price, Exercisable (in dollars per share)		$ 3.36
Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit		6.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit		$ 6.80
Outstanding (in shares)		49,600
Weighted Average Exercise Price, Outstanding (in dollars per share)		$ 6.80
Weighted Average Remaining Contractual Life		182 days
Exercisable (in shares)		49,600
Weighted Average Exercise Price, Exercisable (in dollars per share)		$ 6.80
Range Six [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit		7.48
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit		$ 7.48
Outstanding (in shares)		1,500
Weighted Average Exercise Price, Outstanding (in dollars per share)		$ 7.48
Weighted Average Remaining Contractual Life		182 days
Exercisable (in shares)		1,500
Weighted Average Exercise Price, Exercisable (in dollars per share)		$ 7.48
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 0.09	0.09
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 0.10	$ 7.48
Outstanding (in shares)	3,072,950	2,870,950	1,724,520
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 0.52	$ 0.40	$ 4.07
Weighted Average Remaining Contractual Life		4 years 109 days
Exercisable (in shares)	2,164,550	2,383,617
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 0.70	$ 0.46