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Note 7 - Segment Reporting (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019
Number of Reportable Segments |  |  | 2 |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 701,355 | $ 601,135 | $ 1,724,118 | $ 1,613,404 |
Adjusted EBITDA | $ 178,778 | $ 125,953 | $ 387,942 | $ 324,967 |
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage | 84.00% | 78.00% | 82.00% | 75.00% |
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage |  |  | 82.00% |  | 80.00%
Amounts Adjusted from the Domestic Segment to the International Segment [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  | $ 3,353 |  | $ 10,509 |
Adjusted EBITDA |  | $ 384 |  | $ 976 |

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