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Note 20 - Concentration of Risk (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Customer A |  | Customer B |  | Customer C
Six Months Ended June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Revenues, customer concentration risk |  |  | 13 | % |  |  | - |  |  |  | * |
Three Months Ended June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Revenues, customer concentration risk |  |  | 11 | % |  |  | - |  |  |  | - |
Six Months Ended June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Revenues, customer concentration risk |  |  | 14 | % |  |  | 14 | % |  |  | * |
Three Months Ended June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Revenues, customer concentration risk |  |  | 19 | % |  |  | * |  |  |  | 11 | %
As of June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, customer concentration risk |  |  | 66 | % |  |  | - |  |  |  | * |
As of December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, customer concentration risk |  |  | 74 | % |  |  | - |  |  |  | 12 | %
|  | Supplier A |  | Supplier B
Six Months Ended June 30, 2019 |  |  |  |  |  |  |  |
Cost of revenues, supplier concentration risk |  |  | 90 | % |  |  | * |
Three Months Ended June 30, 2019 |  |  |  |  |  |  |  |
Cost of revenues, supplier concentration risk |  |  | 91 | % |  |  | * |
Six Months Ended June 30, 2018 |  |  |  |  |  |  |  |
Cost of revenues, supplier concentration risk |  |  | 83 | % |  |  | 13 | %
Three Months Ended June 30, 2018 |  |  |  |  |  |  |  |
Cost of revenues, supplier concentration risk |  |  | 87 | % |  |  | 10 | %

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