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Note 5 - Accounts Receivable and Customer Concentrations (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Revenue |  |  | Accounts Receivable |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Customer A |  |  | 13.2 | % |  |  | 22.5 | % |  |  | 14.2 | % |  |  | 23.6 | %
Customer B |  |  | 28.5 | % |  |  | 2.0 | % |  |  | 52.2 | % |  |  | 28.9 | %
Customer C |  |  | 10.3 | % |  |  | 18.7 | % |  |  | 5.2 | % |  |  | 6.4 | %
Customer D |  |  | 3.6 | % |  |  | 3.9 | % |  |  | 3.2 | % |  |  | 11.6 | %

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