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Note 3 - Selmec Acquisition (Details Textual) - USD ($) $ in Thousands | Jun. 01, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Goodwill, Ending Balance |  | $ 758,072 | $ 721,523
Selmec [Member] |  |  |
Business Combination, Consideration Transferred, Total | $ 78,307 |  |
Business Combination, Contingent Consideration, Liability, Total | 6,750 |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill | 76,504 |  |
Selmec [Member] | International [Member] |  |  |
Goodwill, Ending Balance | $ 38,538 |  |

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