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Note 7 - Segment Reporting (Details Textual) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Number of Reportable Segments | 2 |
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES |  |
Concentration Risk, Percentage | 83.00% | 77.00%
Geographic Concentration Risk [Member] | Net Assets, Geographic Area [Member] | UNITED STATES |  |
Concentration Risk, Percentage | 82.00% | 81.00%

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