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Note 12 - Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Tables)
9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months
Ended
September 30,
   
Nine Months
Ended
September 30,
 
   
2014
   
2013
   
2014
   
2013
 
Numerator:
                       
Net loss attributable to Sterling common stockholders
  $ (3,935 )   $ (189 )   $ (2,529 )   $ (21,792 )
Revaluation of the noncontrolling interest obligations reflected in retained earnings, net of tax
    -       (766 )     -       (1,100 )
    $ (3,935 )   $ (955 )   $ (2,529 )   $ (22,892 )
Denominator:
                               
Weighted average common shares outstanding — basic
    18,809       16,652       17,814       16,626  
Shares for dilutive unvested common stock and stock options 
    -       -       -       -  
Weighted average common shares outstanding and assumed conversions — diluted 
    18,809       16,652       17,814       16,626  
Basic loss per share attributable to Sterling common stockholders
  $ (0.21 )   $ (0.06 )   $ (0.14 )   $ (1.38 )
Diluted loss per share attributable to Sterling common stockholders
  $ (0.21 )   $ (0.06 )   $ (0.14 )   $ (1.38 )