Note 11 - Construction Joint Ventures (Details Textual) $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Contract Value of Active Construction Joint Venture Projects	$ 3,000,000
Contract with Customer, Liability, Total	165,358	$ 153,633	$ 200,041
Revenue from Contract with Customer, Including Assessed Tax	547,586	566,332
Retained Earnings (Accumulated Deficit), Total	402,550	352,610	410,831
Unconsolidated Construction Joint Venture Net Income (Loss)	$ (3,627)	418
Unconsolidated Construction Corporate Joint Venture [Member]
Number of Active Joint Venture Projects	9
Contract Value of Active Construction Joint Venture Projects	$ 10,700,000
Contract with Customer, Liability, Total	135,700
Affirmative Claim Recovery Estimate	107,500	95,400	103,800
Back Charge Claims	2,900	12,900	10,700
Retained Earnings (Accumulated Deficit), Total	14,900	55,600	28,600
Unconsolidated Construction Corporate Joint Venture [Member] \| Minimum [Member]
Contract Value of Active Construction Joint Venture Projects	13,900
Contract with Customer, Liability, Total	$ 1,300
Equity Method Investment, Ownership Percentage	20.00%
Unconsolidated Construction Corporate Joint Venture [Member] \| Maximum [Member]
Contract Value of Active Construction Joint Venture Projects	$ 3,800,000
Contract with Customer, Liability, Total	$ 36,100
Equity Method Investment, Ownership Percentage	50.00%
Unconsolidated Construction Corporate Joint Venture [Member] \| Performance Guarantee [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 200,000
Guarantor Obligations, Current Carrying Value	82,100	82,300	$ 82,100
Co-venturer [Member] \| Performance Guarantee [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	300,000
Consolidated Construction Corporate Joint Venture [Member]
Contract Value of Active Construction Joint Venture Projects	$ 960,000
Consolidated Construction Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member]
Number of Active Joint Venture Projects	9
Contract Value of Active Construction Joint Venture Projects	$ 1,700,000
Contract with Customer, Liability, Total	227,200
Revenue from Contract with Customer, Including Assessed Tax	107,600	82,600
Net Cash Provided by (Used in) Continuing Operations, Total	(7,600)	$ 13,800
Consolidated Construction Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Minimum [Member]
Contract Value of Active Construction Joint Venture Projects	12,000
Contract with Customer, Liability, Total	$ 6,500
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	50.00%
Consolidated Construction Corporate Joint Venture [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Maximum [Member]
Contract Value of Active Construction Joint Venture Projects	$ 437,200
Contract with Customer, Liability, Total	68,400
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage		70.00%
Line Item Joint Venture [Member]
Contract Value of Active Construction Joint Venture Projects	221,400
Contract with Customer, Liability, Total	64,900
Revenue from Contract with Customer, Including Assessed Tax	6,400	$ 8,600
Unconsolidated Construction Joint Venture Net Income (Loss)	339,200
Construction [Member]
Revenue from Contract with Customer, Including Assessed Tax	474,935	$ 506,971
Construction [Member] \| Unconsolidated Construction Corporate Joint Venture [Member]
Contract with Customer, Liability, Revenue Recognized	$ 500,000

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