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Note 8 - Segment Reporting (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Number of Reportable Segments |  |  | 2 |  |
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage | 78.00% | 76.00% | 74.00% | 74.00% |
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage |  |  | 80.00% |  | 85.00%

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