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Note 3 - Trade Accounts Receivable - Accounts Receivable Balances (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Billed | $ 57,495 | $ 56,766 |  |
Unbilled | 7,241 | 8,808 |  |
Allowance for doubtful accounts | (2,952) | (2,224) | $ (1,335) | $ (994)
Total accounts receivable—net | $ 61,784 | $ 63,350 |  |

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