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Note 9 - Share-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of sales |  | $ | 255 |  |  | $ | 125 |  |  | $ | 576 |  |  | $ | 249 |
Selling, general, and administrative expense |  |  | 618 |  |  |  | 416 |  |  |  | 1,730 |  |  |  | 967 |
Total |  | $ | 873 |  |  | $ | 541 |  |  | $ | 2,306 |  |  | $ | 1,216 |
Schedule of Unvested Restricted Stock Units and Performance Share Awards Activity [Table Text Block] |
|  | Number of RSUs and PSAs (1) |  |  | Weighted- Average Grant Date Fair Value |
Unvested RSUs and PSAs as of December 31, 2019 |  |  | 85,170 |  |  | $ | 23.56 |
RSUs and PSAs granted |  |  | 97,834 |  |  |  | 26.61 |
Unvested RSUs and PSAs canceled |  |  | (3,752 | ) |  |  | 23.56 |
RSUs and PSAs vested (2) |  |  | (49,680 | ) |  |  | 23.56 |
Unvested RSUs and PSAs as of September 30, 2020 |  |  | 129,572 |  |  |  | 25.86 |

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