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Note 5 - Revisions in Estimates - Summary of Impact of Revisions in Estimates to Gross Profit (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Range of reduction in gross profit from each project, net	$ (125,997)	$ (122,558)	$ (238,139)	$ (170,454)
Decrease to project profitability	$ 87,085	$ (56,513)	177,088	48,157
Deferred income taxes			$ 996	$ (2,150)
Diluted (in dollars per share) | $ / shares	$ (2.00)	$ 0.97	$ (3.36)	$ (0.87)
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges [Member]
Number of projects with downward estimate changes	3	4	6	10
Range of reduction in gross profit from each project, net					$ (5,000)	$ (5,000)
Decrease to project profitability	$ 32,200	$ 37,000	$ 107,500	$ 162,500
Deferred income taxes	$ 21,700	$ 29,000	$ 72,600	$ 127,600
Diluted (in dollars per share) | $ / shares	$ 0.48	$ 0.62	$ 1.59	$ 2.73
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges [Member] | Minimum [Member]
Range of reduction in gross profit from each project, net	$ 7,200	$ 5,600	$ 6,500	$ 5,900
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges [Member] | Maximum [Member]
Range of reduction in gross profit from each project, net	$ 17,800	$ 13,600	$ 37,600	$ 48,000

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