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Note 3 - Trade Accounts Receivable - Accounts Receivable Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Billed	$ 68,584	$ 57,495
Unbilled	12,629	7,241
Current estimated credit losses	(3,482)	(2,952)	$ (2,224)	$ (1,335)
Total accounts receivable—net	$ 77,731	$ 61,784

X

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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