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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