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Note 11 - Net Income (Loss) per Share Attributable to Sterling Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2012
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
   
Three Months Ended
September 30,
   
Nine MonthsEnded
September 30,
 
   
2012
   
2011
   
2012
   
2011
 
Numerator:
                       
Net income (loss) attributable to Sterling common stockholders
  $ 990     $
3,461
    $ (3,223 )   $
7,716
 
Revaluation of the RLW noncontrolling interest put/call liability reflected in retained earnings, net of tax
    (762 )     --       (1,239 )     --  
    $ 228     $
3,461
    $ (4,462 )   $
7,716
 
Denominator:
                               
Weighted average common shares outstanding — basic
    16,405      
16,386
      16,362      
16,444
 
Shares for dilutive stock options and warrants 
    99      
55
      --      
114
 
Weighted average common shares outstanding and assumed conversions— diluted 
    16,504      
16,441
      16,362      
16,558
 
Basic net income (loss) per share attributable to Sterling common stockholders
  $ 0.01     $
0.21
    $ (0.27 )   $
0.47
 
Diluted net income (loss) per share attributable to Sterling common stockholders
  $ 0.01     $
0.21
    $ (0.27 )   $
0.47