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Note 4 - Acquisition-related Items (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Acquisition Related Expenses [Table Text Block] |
|  |  | 2017 |  |  |  | 2016 |
Transaction costs |  | $ | 6,247 |  |  | $ | 2,794 |
Contingent consideration fair value adjustments |  |  | 1,054 |  |  |  | (4,591 | )
Contingent consideration compensation expense |  |  | 7,626 |  |  |  | 5,356 |
|  | $ | 14,927 |  |  | $ | 3,559 |

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