Note 4 - Revisions in Estimates (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Gross Profit, Total	$ 63,318	$ 23,799
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges [Member]
Gross Profit, Total	$ 5,300

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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+ Details