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Note 2 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Awards Available |  | Options Outstanding |  | Weighted Average Exercise Price
Balance December 31, 2018 |  |  | 805 |  |  |  | 17,491 |  |  | $ | 6.49 |
Plan amendment |  |  | 4,000 |  |  |  | — |  |  |  | — |
Stock option awards granted |  |  | (826 | ) |  |  | 826 |  |  |  | 6.90 |
Stock option awards exercised |  |  | — |  |  |  | (251 | ) |  |  | 3.75 |
Stock option awards cancelled |  |  | 123 |  |  |  | (123 | ) |  |  | 7.28 |
Balance June 30, 2019 |  |  | 4,102 |  |  |  | 17,943 |  |  | $ | 6.54 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2019 |  | 2018
Expected Life in Years |  |  | 5.5 |  |  |  | 5.5 |
Expected Volatility |  |  | 81.0 | % |  |  | 82.0 | %
Expected Dividend Yield |  |  | 0.0 | % |  |  | 0.0 | %
Risk-Free Interest Rate |  |  | 2.3 | % |  |  | 2.7 | %

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