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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 | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Revenue by customers’ geographic locations, percentage | 100.00% | 100.00% | 100.00% | 100.00%
UNITED STATES |  |  |  |
Revenue by customers’ geographic locations, percentage | 70.00% | 71.00% | 73.00% | 66.00%
CANADA |  |  |  |
Revenue by customers’ geographic locations, percentage | 18.00% | 17.00% | 14.00% | 20.00%
EMEA [Member] |  |  |  |
Revenue by customers’ geographic locations, percentage | 10.00% | 11.00% | 11.00% | 12.00%
Geographic, Other [Member] |  |  |  |
Revenue by customers’ geographic locations, percentage | 2.00% | 1.00% | 2.00% | 2.00%

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