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Note 1 - Organization and Significant Accounting Policies - Concentrations Risk by Geographic Locations (Details) - Revenue Benchmark [Member] - Geographic Concentration Risk [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenue by customers’ geographic locations, percentage | 100.00% | 100.00% | 100.00% | 100.00%
North America [Member] |  |  |  |
Revenue by customers’ geographic locations, percentage | 88.00% | 84.00% | 87.00% | 86.00%
EMEA [Member] |  |  |  |
Revenue by customers’ geographic locations, percentage | 9.00% | 13.00% | 10.00% | 12.00%
Geographic, Other [Member] |  |  |  |
Revenue by customers’ geographic locations, percentage | 3.00% | 3.00% | 3.00% | 2.00%

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