Note 7 - Stockholders' Equity (Tables)

3 Months Ended

Sep. 30, 2016

Notes Tables

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

	Weighted Average, September 30, 2016			Range, September 30, 2016				Weighted Average, September 30, 2015		Range, September 30, 2015
Volatility		81	%		78%	-	86%		-		-
Dividend yield		-				-			-		-
Risk-free interest rate		0.93	%		0.82%	-	0.97%		-		-
Expected term (years)		3.7			3	-	4		-		-

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, 2016		4,225,537	$	1.79		4.1	$	158,675
Granted		35,000		1.00
Exercised		-		-
Forfeited		-		-
Expired		-		-
Outstanding at September 30, 2016		4,260,537	$	1.78		3.4	$	124,375
Exercisable at September 30, 2016		4,210,537	$	1.80		3.4	$	111,875

Schedule of Nonvested Share Activity [Table Text Block]

	Options			Weighted Average Grant-Date Fair Value
Nonvested at July 1, 2016		50,000		$	0.76
Granted		35,000			0.45
Vested		(35,000	)		(0.45	)
Nonvested at September 30, 2016		50,000		$	0.76

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

	Three months ended September 30, 2016		Three months ended September 30, 2015
General and administrative:
Fair value of stock options expensed	$	16,495	$	1,838
Total	$	16,495	$	1,838
Research and development:
Fair value of stock options expensed	$	4,361	$	13,482
Total	$	4,361	$	13,482