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Note 5 - Stock-based Compensation; Changes in Equity (Tables) | 3 Months Ended
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Mar. 31, 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 |  |  | 612,660 |  |  |  | 1.00 |
Cancelled/Expired |  |  | 432,519 |  |  |  | - |
Exercised/Issued |  |  | 15,000 |  |  |  | 5.48 |
Outstanding at March 31, 2020 |  |  | 636,285 |  |  | $ | 1.10 |
Exercisable at March 31, 2020 |  |  | 19,625 |  |  | $ | 5.48 |

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