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Note 12 - Significant Customers / Concentration (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | For the Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Customer A |  |  | 27 | % |  |  | 29 | %
Customer B |  |  | 10 | % |  |  | 15 | %
Customer C |  |  | - | % |  |  | 18 | %
|  | December 31, 2020 |  |  | December 31, 2019 |
Customer A |  |  | 39 | % |  |  | 39 | %
Customer B |  |  | 12 | % |  |  | - | %
Customer D |  |  | 16 | % |  |  | - | %
Customer E |  |  | - | % |  |  | 15 | %

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