Note 7 - Stockholders' Equity (Tables)
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9 Months Ended |
Mar. 31, 2019 |
Notes Tables |
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Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| | Weighted Average, March 31, 2019 | | | Range, March 31, 2019 | | | Weighted Average, March 31, 2018 | | | Range, March 31, 2018 | | Volatility | | | 69% | | | 58% | - | 76% | | | | 74% | | | 68% | - | 75% | | Dividend yield | | | - | | | | - | | | | | - | | | | - | | | Risk-free interest rate | | | 2.71% | | | 2.52% | - | 2.78% | | | | 2.44% | | | 1.75% | - | 2.64% | | Expected term (years) | | | 3.8 | | | 1.9 | to | 4.3 | | | | 5 | | | 3 | - | 6 | |
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Share-based Payment Arrangement, Option, 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 | | | 350,000 | | | | 0.68 | | | | | | | | | | Exercised | | | - | | | | - | | | | | | | | | | Forfeited | | | - | | | | - | | | | | | | | | | Expired | | | (70,625 | ) | | | 1.26 | | | | | | | | | | Outstanding at March 31, 2019 | | | 7,106,600 | | | $ | 1.09 | | | | 3.3 | | | $ | 57,050 | | Exercisable at March 31, 2019 | | | 7,106,600 | | | $ | 1.09 | | | | 3.3 | | | $ | 57,050 | |
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Schedule of Nonvested Share Activity [Table Text Block] |
| | Options | | | Weighted Average Grant-Date Fair Value | | Nonvested at July 1, 2018 | | | - | | | $ | - | | Granted | | | 350,000 | | | | 0.35 | | Vested | | | (350,000 | ) | | | 0.35 | | Nonvested at March 31, 2019 | | | - | | | $ | - | |
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Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
| | Three months ended March 31, 2019 | | | Three months ended March 31, 2018 | | | Nine months ended March 31, 2019 | | | Nine months ended March 31, 2018 | | General and administrative: | | | | | | | | | | | | | | | | | Fair value of stock bonuses expensed | | $ | - | | | $ | 1,500 | | | $ | - | | | $ | 8,723 | | Change in fair value from modification of option terms | | | - | | | | - | | | | 211,185 | | | | 243,761 | | Change in fair value from modification of warrant terms | | | - | | | | 7,091 | | | | 118,233 | | | | 163,956 | | Fair value of stock options expensed | | | 5,250 | | | | 682,485 | | | | 97,375 | | | | 782,135 | | Total | | $ | 5,250 | | | $ | 691,076 | | | $ | 426,793 | | | $ | 1,198,575 | | | | | | | | | | | | | | | | | | | Research and development: | | | | | | | | | | | | | | | | | Fair value of stock bonus expensed | | $ | - | | | $ | - | | | $ | - | | | $ | 15,098 | | Change in fair value from modification of option terms | | | - | | | | - | | | | 11,115 | | | | 105,895 | | Change in fair value from modification of warrant terms | | | - | | | | 219 | | | | 44,793 | | | | 132,896 | | Fair value of stock options expensed | | | - | | | | 587,215 | | | | 25,875 | | | | 587,215 | | Total | | $ | - | | | $ | 587,434 | | | $ | 81,783 | | | $ | 841,104 | |
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