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Note 18 - Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Quarterly Financial Information [Table Text Block]
    2016 Quarters Ended (unaudited)    
    March 31   June 30   September 30   December 31   Total
Revenues   $
126,567
     $
189,582
     $
205,629
     $
168,345
     $
690,123
  
Gross profit    
3,830
      
16,089
      
17,032
      
6,903
      
43,854
  
Income (loss) before income taxes and earnings attributable to noncontrolling interests    
(7,336
 )    
2,570
      
3,196
      
(5,754
 )    
(7,324
 )
Net income (loss) attributable to Sterling common stockholders    
(7,328
 )    
2,023
      
2,415
      
(6,348
 )    
(9,238
 )
Net income (loss) per share attributable to Sterling common stockholders:                                        
Basic and diluted   $
(0.37
 )   $
0.09
     $
0.10
     $
(0.25
 )   $
(0.40
 )
    2015 Quarters Ended (unaudited)    
    March 31   June 30   September 30   December 31   Total
Revenues   $
117,682
     $
177,425
     $
176,000
     $
152,488
     $
623,595
  
Gross profit (loss)    
(6,836
 )    
9,111
      
14,458
      
12,220
      
28,953
  
Income (loss) before income taxes and earnings attributable to noncontrolling interests    
(16,697
 )    
(967
 )    
1,326
      
(841
 )    
(17,179
 )
Net income (loss) attributable to Sterling common stockholders    
(16,992
 )    
(2,542
 )    
256
      
(19,898
 )    
(39,176
 )
Net income (loss) per share attributable to Sterling common stockholders:                                        
Basic and diluted   $
(0.90
 )   $
(0.13
 )   $
0.01
     $
(1.01
 )   $
(2.02
 )