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Note 5 - Stock-based Compensation; Changes in Equity (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Shares under Option |  |  | Weighted Average Exercise Price |
Balance at December 31, 2019 |  |  | 471,144 |  |  | $ | 3.95 |
Granted |  |  | 792,660 |  |  |  | 1.00 |
Cancelled/Expired |  |  | (436,519 | ) |  |  | 3.95 |
Exercised/Issued |  |  | (15,000 | ) |  |  | 5.48 |
Outstanding at June 30, 2020 |  |  | 812,285 |  |  |  | 1.21 |
Exercisable at June 30, 2020 |  |  | 19,625 |  |  | $ | 5.49 |

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