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Note 9 - Share Capital	3 Months Ended
Note 9 - Share Capital	Mar. 31, 2020
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	9. Share capital During the three -month period ended March 31, 2020 , the Company issued 16,564 ordinary shares upon the exercise of options and 40,109 ordinary shares were issued upon the vesting of restricted share units, or RSUs. During the year ended December 31, 2019 , the Company issued 394,078 ordinary shares upon the exercise of options and 65,405 ordinary shares were issued upon the vesting of RSUs. In 2019, the Company’s Board of Directors authorized the repurchase of up to $100 million of its ordinary shares in the aggregate, subject to the approval of its shareholders by an ordinary resolution at its 2019 Annual General Meeting, or the share repurchase program. The share repurchase program was approved by the Company’s shareholders at its Annual General Meeting held on June 18, 2019. The Company began repurchasing shares in September 2019. For the four month period ended December 31, 2019, the Company purchased a total of 478,856 shares for a total cost of $7.0 million. During the three -month period ended March 31, 2020 , the Company repurchas ed 530,890 ordinary s hares at a total cost o f $7.7 mill ion. The share repurchase program allows for a maximum repurchase of $100 million of the Company’s ordinary shares, including commissions. At March 31, 2020 , $ 85.3 m illion of ordinary shares remain eligible for repurchase. In an effort to conserve cash, as a result of the COVID- 19 pandemic, the Company has currently paused its share repurchase program. The repurchase program may be resumed by the Company at any time prior to its expiration or earlier termination. The share repurchase program may be suspended, modified or terminated at any time. The Company has no obligation to repurchase any amount of its ordinary shares under the program. Unless terminated by the Company's Board of Directors, the share repurchase program will be valid for up to five years.