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Note 10 - Significant Customers (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Year ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Customer A |  |  | 16.1 | % |  |  | 16.3 | % |  |  | 14.2 | %
Customer B |  |  | - | %* |  |  | - | %* |  |  | 10.4 | %
Total |  |  | 16.1 | % |  |  | 16.3 | % |  |  | 24.6 | %
| As of December 31, |
| 2017 |  | 2016 |
Customer A |  | 20.3 | % |  | 13.4 | %
Customer B |  | 11.0 | % |  | 11.7 | %
Total |  | 31.3 | % |  | 25.1 | %

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