Note 4 - Revisions in Estimates (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gross Profit, Total	$ 91,432	$ 144,491	$ 79,506	$ 281,143
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	25,387	67,789	(140,580)	50,711
Net Income (Loss) Attributable to Parent, Total	$ 20,488	$ 55,672	$ (111,922)	$ 35,864
Earnings Per Share, Diluted, Total	$ 0.43	$ 1.17	$ (2.39)	$ 0.84
Change In Accounting Estimate Financial Effect On Gross Profit	$ 5,000
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges [Member]
Gross Profit, Total	(5,000)	$ (5,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	(80,700)	(19,300)	$ (264,100)	$ (57,800)
Net Income (Loss) Attributable to Parent, Total	$ (62,900)	$ (14,600)	$ (200,600)	$ (43,700)
Earnings Per Share, Diluted, Total	$ (1.33)	$ (0.31)	$ (4.29)	$ (1.02)