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Note 3 - Revenue Recognition - Components of Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trade receivables $ 5,015 $ 6,425  
Unbilled receivables 2,348 1,857  
Other short-term receivables 20 7  
Allowance for doubtful accounts (835) (1,816) $ (1,411)
Total accounts receivable $ 6,548 $ 6,473