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Note 3 - Revenue - Components of Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Trade receivables | $ 5,423 | $ 5,015
Unbilled receivables | 375 | 2,348
Other short-term receivables | 102 | 20
Allowance for doubtful accounts | (838) | (835)
Total accounts receivable | $ 5,062 | $ 6,548

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