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Note 1 - Organization and Significant Accounting Policies - Concentrations Risk by Geographic Locations (Details) - Geographic Concentration Risk [Member] - Revenue Benchmark [Member] | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Revenue by customers’ geographic locations, percentage | 100.00% | 100.00%
Revenue by customers’ geographic locations, percentage | 100.00% | 100.00%
UNITED STATES |  |
Revenue by customers’ geographic locations, percentage | 69.00% | 77.00%
Revenue by customers’ geographic locations, percentage | 69.00% | 77.00%
CANADA |  |
Revenue by customers’ geographic locations, percentage | 16.00% | 13.00%
Revenue by customers’ geographic locations, percentage | 16.00% | 13.00%
EMEA [Member] |  |
Revenue by customers’ geographic locations, percentage | 14.00% | 8.00%
Revenue by customers’ geographic locations, percentage | 14.00% | 8.00%
Geographic, Other [Member] |  |
Revenue by customers’ geographic locations, percentage | 1.00% | 2.00%
Revenue by customers’ geographic locations, percentage | 1.00% | 2.00%

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