Note 4 - Revisions in Estimates (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Gross Profit, Total	$ 116,946	$ 88,343	$ 180,264	$ 112,142
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges [Member]
Gross Profit, Total	$ 0		$ 5,000	$ 5,000

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

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+ Details