Note 9 - Stockholders' Equity (Tables)

12 Months Ended

Jun. 30, 2015

Stockholders' Equity Note [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Weighted average, June 30, 2015		Range, June 30, 2015			Weighted average, June 30, 2014		Range, June 30, 2014
Volatility		76%	74%	-	80%		54%	49%	-	65%
Dividend yield		-		-			-		-
Risk-free interest rate		1.55%	0.51%	-	1.79%		0.95%	0.59%	-	1.69%
Expected term (years)		6.1	2	-	10		3.29	2.63	-	4.67

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life		Aggregate Intrinsic Value
Outstanding at July 1, 2013		5,261,145		$	2.84		4.0		-
Granted		97,725			1.35
Exercised		-			-
Forfeited		(200,000	)		3.00
Expired		(900,000	)		2.84
Outstanding at June 30, 2014		4,258,870			2.81		3.2		-
Granted		957,500			0.74
Exercised		-			-
Forfeited		-			-
Expired		(802,500	)		2.7
Outstanding at June 30, 2015		4,413,870		$	1.88		4.3	$	398,250
Exercisable at June 30, 2015		4,313,870		$	1.91		4.2	$	344,250

Schedule of Nonvested Share Activity [Table Text Block]

	Options			Weighted Average Grant-Date Fair Value
Nonvested at July 1, 2014		-		$	-
Granted		957,500			0.58
Vested		(857,500	)		(0.56	)
Nonvested at June 30, 2015		100,000		$	0.76

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Year ended June 30, 2015		Year ended June 30, 2014
General and administrative:
Fair value of stock options expensed/(credited)	$	378,937	$	(87,517	)
Fair value of stock issued to an employee		-		94,998
Change in fair value from modification of option terms		369,283		307,638
Change in fair value from modification of warrant terms		223,917		-
Total	$	972,137	$	315,119
Research and development:
Fair value of stock options expensed/(credited)	$	122,672	$	(116,739	)
Total	$	122,672	$	(116,739	)