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Note 18 - Contingencies - Legal Proceedings (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 16, 2022
Apr. 14, 2022
Feb. 04, 2022
Feb. 03, 2022
Oct. 06, 2021
Apr. 29, 2021
Sep. 30, 2022
Mar. 31, 2021
Sep. 30, 2022
Dec. 31, 2021
Jun. 30, 2022
Loss Contingency Accrual, Ending Balance             $ 129.0   $ 129.0 $ 129.0  
Police Retirement System of St. Louis v. Granite Construction Incorporated, et al. [Member]                      
Loss Contingency Accrual, Ending Balance             66.0   66.0    
Loss Contingency, Proceeds From Insurance Recovery         $ 63.0       63.0 $ 63.0  
Gain (Loss) Related to Litigation Settlement               $ (66.0)      
Litigation Settlement, Amount Awarded to Other Party           $ 129.0          
Payment to Contingency Settlement Fund         129.0            
Loss Contingency Accrual, Payments         66.0            
Litigation Settlement, Settlement Fund Amount         $ 129.0            
English v. Roberts et al. [Member]                      
Loss Contingency, Damages Sought, Value   $ 7.5                  
Proceeds from Legal Settlements             5.0   $ 5.0    
SEC Investigation [Member]                      
Loss Contingency Accrual, Ending Balance                     $ 12.0
Litigation Settlement, Amount Awarded to Other Party             $ 12.0        
Payments for Legal Settlements $ 12.0                    
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]                      
Loss Contingency, Estimate of Possible Loss     $ 100.0                
Steadfast Insurance Company (“Steadfast”), a subrogee of Clark/Hathaway Dinwiddie, a Joint Venture (“CHDJV”) v. Layne Christensen Company [Member] | Steadfast [Member]                      
Loss Contingency, Damages Sought, Value       $ 70.0              
Steadfast Insurance Company (“Steadfast”), a subrogee of Clark/Hathaway Dinwiddie, a Joint Venture (“CHDJV”) v. Layne Christensen Company [Member] | CHDJV [Member]                      
Loss Contingency, Damages Sought, Value     $ 30.0