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Note 4 - Accounts Receivable and Customer Concentrations (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Revenue |  |  | Accounts Receivable |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Customer A |  |  | 75 | % |  |  | 71 | % |  |  | 76 | % |  |  | 65 | %

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