Note 7 - Stockholders' Equity (Tables)

6 Months Ended

Dec. 31, 2016

Notes Tables

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

	Weighted Average, December 31, 2016			Range, December 31, 2016			Weighted Average, December 31, 2015			Range, December 31, 2015
Volatility		79	%	78%	-	86%		74	%		74	%
Dividend yield		-			-			-			-
Risk-free interest rate		1.14	%	0.82%	-	1.17%		1.75	%		1.75	%
Expected term (years)		4.0		3	-	4		5			5

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		294,500		1.00
Exercised		-		-
Forfeited		-		-
Expired		-		-
Outstanding at December 31, 2016		4,520,037	$	1.42		3.4	$	31,125
Exercisable at December 31, 2016		4,420,037	$	1.44		3.3	$	38,625

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		294,500			0.47
Vested		(244,500	)		(0.47	)
Nonvested at December 31, 2016		100,000		$	0.61

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

	Three months ended December 31, 2016		Three months ended December 31, 2015		Six months ended December 31, 2016		Six months ended December 31, 2015
General and administrative:
Fair value of stock bonuses expensed	$	6,830	$	69,000	$	6,830	$	69,000
Change in fair value from modification of option terms		166,031		42,550		166,031		42,550
Fair value of stock options expensed		90,067		62,371		106,565		64,209
Total	$	262,928	$	173,921	$	279,426	$	175,759
Research and development:
Fair value of stock bonus expensed	$	7,954	$	-	$	7,954	$	-
Change in fair value from modification of option terms		11,440		-		11,440		-
Fair value of stock options expensed		18,889		11,949		23,251		25,431
Total	$	38,283	$	11,949	$	42,645	$	25,431