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Note 2 - Revenue Recognition - Components of Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Trade receivables | $ 4,605 | $ 2,122 |
Unbilled receivables | 3,082 | 1,277 |
Other short-term receivables | 152 | 83 |
Allowance for doubtful accounts | (110) | (223) | $ (835)
Total accounts receivable | $ 7,729 | $ 3,259 |

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