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Note 4 - Revisions in Estimates (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Gross Profit, Total | $ 119,935 | $ 125,997 | $ 300,199 | $ 238,139
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges [Member] |  |  |  |
Gross Profit, Total |  |  | $ 5,000 | $ 5,000

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