Note 7 - Stockholders' Equity (Tables)

6 Months Ended

Dec. 31, 2018

Notes Tables

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

	Weighted Average, December 31, 2018		Range, December 31, 2018				Weighted Average, December 31, 2017		Range, December 31, 2017
Volatility		70%		63%	-	76%		73%		73%
Dividend yield		-			-			-		-
Risk-free interest rate		2.73%		2.68%	-	2.78%		1.75%		1.75%
Expected term (years)		3.9		3.4	to	4.3		3		3

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, 2018		6,827,225	$	1.11		3.8	$	-
Granted		325,000		0.68
Exercised		-		-
Forfeited		-		-
Expired		-		-
Outstanding at December 31, 2018		7,152,225	$	1.10		3.5	$	36,675
Exercisable at December 31, 2018		7,002,225	$	1.11		3.6	$	23,175

Schedule of Nonvested Share Activity [Table Text Block]

	Options			Weighted Average Grant-Date Fair Value
Nonvested at July 1, 2018		-		$	-
Granted		325,000			0.36
Vested		(175,000	)		0.46
Nonvested at December 31, 2018		150,000		$	0.25

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

	Three months ended December 31, 2018		Three months ended December 31, 2017		Six months ended December 31, 2018		Six months ended December 31, 2017
General and administrative:
Fair value of stock bonuses expensed	$	-	$	3,090	$	-	$	7,223
Change in fair value from modification of option terms		-		243,761		211,185		243,761
Change in fair value from modification of warrant terms		-		156,865		118,233		156,865
Fair value of stock options expensed		22,500		97,350		92,125		99,650
Total	$	22,500	$	501,066	$	421,543	$	507,499
Research and development:
Fair value of stock bonus expensed	$	-	$	8,071	$	-	$	15,098
Change in fair value from modification of option terms		-		105,895		11,115		105,895
Change in fair value from modification of warrant terms		-		132,677		44,793		132,677
Fair value of stock options expensed		-		-		25,875		-
Total	$	-	$	246,643	$	81,783	$	253,670