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Note 4 - Revisions in Estimates (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Change in Accounting Estimate [Table Text Block]

Three Months Ended March 31,

 

2021

  

2020

 

Number of projects with downward estimate changes

  1   2 

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

 $5.3  $5.8 - 22.7 
Decrease to project profitability  5.3   28.5 
Increase to net loss  4.1   21.6 
Increase to net loss per diluted share  0.09   0.47