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Note 5 - Accounts Receivable and Customer Concentrations (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Revenue |  |  |  | Accounts Receivable |
|  | 2018 |  |  | 2017 |  |  |  | 2018 |  |  | 2017 |
Customer A |  |  | 4.9 | % |  |  | 9.3 | % |  |  |  | 4.8 | % |  |  | 15.2 | %
Customer B |  |  | 13.2 | % |  |  | 26.6 | % |  |  |  | 13.9 | % |  |  | 25.8 | %
Customer C |  |  | 7.2 | % |  |  | 11.9 | % |  |  |  | 4.0 | % |  |  | 9.0 | %
Customer D |  |  | 3.8 | % |  |  | 11.3 | % |  |  |  | 0.1 | % |  |  | 7.6 | %
Customer E |  |  | 40.1 | % |  |  | -- | % |  |  |  | 52.6 | % |  |  | -- | %

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