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Note 3 - Selmec Acquisition (Details Textual) - USD ($) $ in Thousands | Jun. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Goodwill, Ending Balance |  | $ 769,168 | $ 721,523
Selmec [Member] |  |  |
Business Combination, Consideration Transferred, Total | $ 86,459 |  |
Business Combination, Contingent Consideration, Liability, Total | 14,902 |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill | 81,500 |  |
Selmec [Member] | International [Member] |  |  |
Goodwill, Ending Balance | $ 47,870 |  |

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