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Note 4 - Revisions in Estimates (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Change in Accounting Estimate [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Number of projects with downward estimate changes

  2   3   5   6 

Amount/range of reduction in gross profit from each project, net

 $5.7 - 10.9  $7.2 - 17.8  $5.5 - 16.2  $6.5 - 37.6 

Decrease to project profitability

  16.6   32.2   48.2   107.5 

Decrease to net income/increase to net loss

  13.0   21.7   37.7   72.6 

Amounts attributable to non-controlling interests

  5.5   8.9   10.0   26.3 

Decrease to net income/increase to net loss attributable to Granite Construction Incorporated

  7.5   12.8   27.7   46.3 

Decrease to net income/increase to net loss per diluted share attributable to common shareholders (1)

  0.16   0.28   0.58   1.01