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Note 20 - Contingencies - Legal Proceedings (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 04, 2022
Feb. 03, 2022
Apr. 29, 2021
Oct. 31, 2021
Mar. 31, 2021
Dec. 31, 2021
Loss Contingency Accrual, Ending Balance           $ 129
Loss Contingency Accrual, Payments           66
Loss Contingency, Estimate of Possible Loss           4,000
Police Retirement System of St. Louis v. Granite Construction Incorporated, et al. [Member]            
Loss Contingency, Proceeds From Insurance Recovery       $ 63   63
Litigation Settlement, Amount Awarded to Other Party     $ 129      
Payment to Contingency Settlement Fund       129    
Loss Contingency Accrual, Payments       66    
Litigation Settlement, Settlement Fund Amount       $ 129    
Gain (Loss) Related to Litigation Settlement, Total         $ 66  
Damages Related to Salesforce Tower Office Building in San Francisco [Member] | Potential Legal Action Not Yet Taken Against the Company [Member]            
Loss Contingency, Estimate of Possible Loss           $ 100
Steadfast Insurance Company (“Steadfast”), a subrogee of Clark/Hathaway Dinwiddie, a Joint Venture (“CHDJV”) v. Layne Christensen Company [Member] | Steadfast [Member] | Subsequent Event [Member]            
Loss Contingency, Damages Sought, Value   $ 70        
Steadfast Insurance Company (“Steadfast”), a subrogee of Clark/Hathaway Dinwiddie, a Joint Venture (“CHDJV”) v. Layne Christensen Company [Member] | CHDJV [Member] | Subsequent Event [Member]            
Loss Contingency, Damages Sought, Value $ 30          
Steadfast Insurance Company (“Steadfast”), a subrogee of Clark/Hathaway Dinwiddie, a Joint Venture (“CHDJV”) v. Layne Christensen Company [Member] | Potential Legal Action Not Yet Taken Against the Company [Member] | Subsequent Event [Member]            
Loss Contingency, Estimate of Possible Loss $ 100