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Note 19 - Segment Information (Details Textual) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Number of Reportable Segments |  |  | 1 |
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |
Concentration Risk, Percentage | 95.00% | 79.00% | 90.00% | 56.00%

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