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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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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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