Note 3 - Revisions in Estimates (Details Textual) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Gross Profit, Total	$ 51,652	$ 101,960	$ 98,232	$ 53,712	$ 93,319	$ 113,015	$ 81,048	$ 17,271		$ 305,556	$ 304,653	$ 189,785
Revisions in Estimates [Member]
Gross Profit, Total										$ 5,000
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges [Member]
Gross Profit, Total									$ 70,600		$ 143,500	$ 199,100