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Note 8 - Receivables, Net - Schedule of Receivables (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Gross receivables | $ 686,506 | $ 544,262 | $ 665,213
Less: allowance for credit losses | 1,684 | 3,450 | 3,265
Total net receivables | 684,822 | 540,812 | 661,948
Completed and in Progress [Member] |  |  |
Billed | 278,313 | 293,376 | 355,293
Unbilled | 217,534 | 148,159 | 167,311
Gross receivables | 495,847 | 441,535 | 522,604
Material Sales [Member] |  |  |
Gross receivables | 80,357 | 49,991 | 70,918
Other Business Products and Services [Member] |  |  |
Gross receivables | $ 110,302 | $ 52,736 | $ 71,691

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