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Note 3 - Revenue - Components of Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Trade receivables $ 3,700 $ 5,015
Unbilled receivables 406 2,348
Other short-term receivables 162 20
Allowance for doubtful accounts (865) (835)
Total accounts receivable $ 3,403 $ 6,548