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Note 7 - Segment Reporting (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018
Number of Reportable Segments |  |  | 2 |  |
Gross Profit, Total | $ 195,838 | $ 178,473 | $ 358,013 | $ 320,400 |
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage | 74.00% | 73.00% | 73.00% | 72.00% |
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage |  |  | 80.00% |  | 80.00%
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | $ 2,632 |  | $ 5,089 |
Gross Profit, Total |  | $ 2,217 |  | $ 4,155 |

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