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Note 5 - Revenues (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax | $ 265,761 | $ 207,434 |
Contract with Customer, Liability, Current | 17,780 |  | $ 15,008
Capitalized Contract Cost, Net, Current | $ 2,800 |  |
Capitalized Contract Cost, Amortization Period | 1 year |  |
Selling, General and Administrative Expenses [Member] |  |  |
Capitalized Contract Cost, Amortization | $ 800 | 700 |
Other Noncurrent Liabilities [Member] |  |  |
Contract with Customer, Liability, Noncurrent | 2,200 |  | 3,100
Other Noncurrent Assets [Member] |  |  |
Contract with Customer, Asset, Net, Noncurrent, Total | 7,700 |  | $ 7,500
Fees Imposed by Various Governmental Authorities Passed Through to Customer [Member] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 4,100 | 3,500 |
Cost of Goods and Services Sold, Total | $ 4,100 | $ 3,500 |

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