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Note 7 - Segment Reporting (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018
Number of Reportable Segments |  |  | 2 |  |
Gross Profit, Total | $ 217,517 | $ 200,334 | $ 575,530 | $ 520,734 |
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage | 78.00% | 78.00% | 75.00% | 74.00% |
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage |  |  | 81.00% |  | 80.00%
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | $ 2,873 |  | $ 7,962 |
Gross Profit, Total |  | $ 2,449 |  | $ 6,604 |

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