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Note 8 - Stockholders' Deficit (Tables)

9 Months Ended

12 Months Ended

Mar. 31, 2019

Jun. 30, 2018

Stockholders’ deficit:

Schedule of Warrant Activity

		Number of Warrants				Weighted Average Exercise Price Per Warrant				Remaining Contract Term (# years)
Warrants outstanding and exercisable at June 30, 2018			1,740,790			$	2.03				0.74
Warrants issued			-			$	-				-
Warrants forfeited			(1,657,457	)		$	2.03				-
Warrants outstanding and exercisable at March 31, 2019			83,333			$	2.00				0.50

Warrant detail for the year ended June 30, 2018 is reflected below:

		Number of Warrants				Weighted Average Exercise Price Per Warrant				Remaining Contract Term (# years)
Warrants outstanding and exercisable at June 30, 2017			2,342,590			$	1.97				0.12 - 1.55
Warrants issued			—			$	—				—
Warrants exchanged			(141,643	)		$	0.60				—
Warrants expired			(460,157	)		$	2.15				—
Warrants outstanding and exercisable at June 30, 2018			1,740,790			$	2.03				0.74

Warrant detail for the year ended June 30, 2017 is reflected below:

		Number of Warrants				Weighted Average Exercise Price Per  Warrant				Remaining Contract Term (# years)
Warrants outstanding and exercisable at June 30, 2016			2,804,010			$	2.00				0.39 - 2.50
Warrants exchanged			(271,420	)		$	1.40				—
Warrants expired			(190,000	)		$	3.00				—
Warrants outstanding and exercisable at June 30, 2017			2,342,590			$	1.97				0.12 - 1.55

Schedule of Stock Option Activity

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contract Term (# years)
Outstanding at June 30, 2018			3,544,473			$	0.83
Granted			2,478,960				1.44
Exercised			-
Forfeited and cancelled			(183,660	)			0.46
Outstanding at March 31, 2019			5,839,773			$	1.10				8.78
Exercisable at March 31, 2019			2,669,193			$	0.96				7.98

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contract Term (# years)
Outstanding at June 30, 2017			716,277			$	1.10
Granted			1,970,000				0.46
Exercised			-
Forfeited and cancelled			(66,910	)		$	0.62
Outstanding at March 31, 2018			2,619,367			$	0.61				8.16
Exercisable at March 31, 2018			1,228,654			$	0.77				7.75

Activity in stock options during the year ended June 30, 2018 and related balances outstanding as of that date are reflected below:

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contract Term (# years)
Outstanding at June 30, 2017			716,277			$	1.10				7.09
Granted			2,925,106				0.78
Exercised			-
Forfeited and cancelled			(96,910	)		$	0.57
Outstanding at June 30, 2018			3,544,473			$	0.83				8.87
Exercisable at June 30, 2018			1,356,806			$	0.74				7.71

Activity in stock options during the year ended June 30, 2017 and related balances outstanding as of that date are reflected below:

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contract Term (# years)
Outstanding at June 30, 2016			900,402			$	1.13
Granted			-
Exercised			-
Forfeited and cancelled			(184,125	)		$	1.63
Outstanding at June 30, 2017			716,277			$	1.10				7.09
Exercisable at June 30, 2017			589,476			$	1.11				6.80

Schedule of Stock-based Compensation

		For the Three Months Ended March 31								For the Nine Months Ended March 31,
		2019				2018				2019				2018
Research and development		$	225,000			$	16,000			$	256,000			$	80,000
General and administration			861,000				29,000				1,236,000				129,000
Total stock-based compensation expense		$	1,086,000			$	45,000			$	1,492,000			$	209,000

Years ended June 30,		2018				2017
Research and development		$	96,000			$	13,000
General and administrative			159,000				27,000
Total stock-based compensation expense		$	255,000			$	40,000

Schedule of Stock Options Valuation Assumptions

Nine months ended March 31,		2019				2018
Expected volatility			111	%			100	%
Risk free interest rate			2.10	%			1.76	%
Forfeiture rate			20.0	%			23.0	%
Dividend yield			0	%			0	%
Expected term (years)			5				5

		2018				2017
Expected volatility		138% -143%					100%
Risk free interest rate		1.76% - 2.63%					1.31%
Forfeiture rate		20% -2 3%					17%-24%
Dividend yield		0%					0%
Expected term (years)		5					3

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