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Note 3 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Number of |  |  | Weighted |
|  | stock |  |  | average grant |
|  | awards |  |  | date fair |
|  | (in thousands) |  |  | value |
Unvested at December 31, 2015 |  |  | 330 |  |  | $ | 12.43 |
Granted |  |  | 120 |  |  | $ | 18.92 |
Vested |  |  | (169 | ) |  | $ | 5.28 |
Forfeited |  |  | (16 | ) |  | $ | 16.53 |
Unvested at December 31, 2016 |  |  | 265 |  |  | $ | 18.63 |
Granted |  |  | 434 |  |  | $ | 16.69 |
Vested |  |  | (96 | ) |  | $ | 12.78 |
Forfeited |  |  | (16 | ) |  | $ | 19.25 |
Unvested at December 31, 2017 |  |  | 587 |  |  | $ | 18.14 |
Granted |  |  | 153 |  |  | $ | 30.32 |
Vested |  |  | (35 | ) |  | $ | 25.97 |
Forfeited |  |  | (30 | ) |  | $ | 27.58 |
Unvested at December 31, 2018 |  |  | 675 |  |  | $ | 20.08 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration