Note 7 - Stockholders' Equity (Tables)

12 Months Ended

Jun. 30, 2017

Notes Tables

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

	Weighted Average, June 30, 2017		Range, June 30, 2017				Weighted Average, June 30, 2016		Range, June 30, 2016
Volatility		78%		73%	-	86%		74%		74%
Dividend yield		-			-			-		-
Risk-free interest rate		1.17%		0.82%	-	1.44%		1.75%		1.75%
Expected term (years)		3.9		3	-	4		5		5

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, 2015		4,413,870		$	1.88		4.1	$	398,250
Granted		100,000			.92
Exercised		-			-
Forfeited		-			-
Expired		(288,333	)		2.90
Outstanding at June 30, 2016		4,225,537		$	1.45		4.1	$	158,675
Granted		319,500			0.97
Exercised		-			-
Forfeited		-			-
Expired		-			-
Outstanding at June 30, 2017		4,545,037		$	1.42		2.9	$	176,575
Exercisable at June 30, 2017		4,520,037		$	1.42		2.9	$	176,575

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		319,500			0.46
Vested		(344,500	)		(0.50	)
Nonvested at June 30, 2017		25,000		$	0.46

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

	Year ended June 30, 2017		Year ended June 30, 2016
General and administrative:
Fair value of stock bonuses expensed	$	15,021	$	69,000
Change in fair value from modification of option terms		166,031		42,550
Fair value of stock options expensed		129,081		66,092
Total	$	310,133	$	177,642
Research and development:
Fair value of stock bonus expensed	$	22,084	$	-
Change in fair value from modification of option terms		11,440		-
Fair value of stock options expensed		23,252		33,461
Total	$	56,776	$	33,461