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Note 3 - Revenue - Components of Accounts Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Trade receivables | $ 5,500 | $ 2,122
Unbilled receivables | 1,106 | 1,277
Other short-term receivables | 78 | 83
Allowance for doubtful accounts | (260) | (223)
Total accounts receivable | $ 6,424 | $ 3,259

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