Note 9 - Stockholders' Equity (Tables)

12 Months Ended

Jun. 30, 2016

Notes Tables

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

	Weighted Average, June 30, 2016		Range, June 30, 2016		Weighted Average, June 30, 2015		Range, June 30, 2015
Volatility		74%		74%		76%	74%	-	80%
Dividend yield		-		-		-		-
Risk-free interest rate		1.75%		1.75%		1.55%	0.51%	-	1.79%
Expected term (years)		5		5		6.1	2	-	10

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, 2014		4,258,870		$	2.81		3.2		-
Granted		957,500			0.74
Exercised		-			-
Forfeited		-			-
Expired		(802,500	)		2.78
Outstanding at June 30, 2015		4,413,870		$	1.88		4.1	$	398,250
Granted		100,000			0.92
Exercised		-			-
Forfeited		-			-
Expired		(288,333	)		2.90
Outstanding at June 30, 2016		4,225,537		$	1.79		3.7	$	158,675
Exercisable at June 30, 2016		4,175,537		$	1.80		3.6	$	144,175

Schedule of Nonvested Share Activity [Table Text Block]

	Options			Weighted Average Grant-Date Fair Value
Nonvested at July 1, 2015		100,000		$	0.76
Granted		100,000			0.59
Vested		(150,000	)		(0.65	)
Nonvested at June 30, 2016		50,000		$	0.76

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

	Year ended June 30, 2016		Year ended June 30, 2015
General and administrative:
Fair value of stock bonus expensed	$	69,000	$	-
Change in fair value from modification of option terms		42,550		369,283
Change in fair value from modification of warrant terms		-		223,917
Fair value of stock options expensed		66,092		378,937
Total	$	177,642	$	972,137
Research and development:
Fair value of stock options expensed	$	33,461	$	122,672
Total	$	33,461	$	122,672