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Note 5 - Acquisition-related Items (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Acquisition Related Expenses [Table Text Block] |
|  | 2016 |  | 2015 |  | 2014
Transaction costs |  | $ | 2,794 |  |  | $ | 5,301 |  |  | $ | 9,103 |
Contingent consideration fair value adjustments |  |  | (4,591 | ) |  |  | 383 |  |  |  | 1,774 |
Contingent consideration compensation expense |  |  | 5,356 |  |  |  | 915 |  |  |  | 226 |
|  | $ | 3,559 |  |  | $ | 6,599 |  |  | $ | 11,103 |

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