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Note 1 - Organization and Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Accounts Receivable |  |  | Revenue |
|  | June 30, |  |  | December 31, |  |  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Customer A |  |  | 17 | % |  |  | 21 | % |  |  | * |  |  |  | * |  |  |  | * |  |  |  | * |
Customer B |  |  | 16 | % |  |  | 11 | % |  |  | 20 | % |  |  | * |  |  |  | 20 | % |  |  | * |
Revenue from External Customers by Products and Services [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Revenue by customers’ geographic locations |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
United States |  |  | 75 | % |  |  | 82 | % |  |  | 77 | % |  |  | 80 | %
Europe, Middle East, Africa (EMEA) |  |  | 17 | % |  |  | 10 | % |  |  | 17 | % |  |  | 11 | %
Canada |  |  | 5 | % |  |  | 5 | % |  |  | 3 | % |  |  | 6 | %
Other |  |  | 3 | % |  |  | 3 | % |  |  | 3 | % |  |  | 3 | %
Total revenue |  |  | 100 | % |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %

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