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Note 6 - Acquisition-related Items (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Acquisition Related Expenses [Table Text Block] |
|  |  | Year ended December 31, |
|  |  | 2020 |  |  |  | 2019 |
Transaction costs (note 4) |  | $ | 16,169 |  |  | $ | 5,725 |
Contingent consideration fair value adjustments |  |  | 23,393 |  |  |  | 10,849 |
Contingent consideration compensation expense |  |  | 6,286 |  |  |  | 11,958 |
|  | $ | 45,848 |  |  | $ | 28,532 |

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