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Note 12 - Net Income (Loss) per Share Attributable to Sterling Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2013
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,
 
   
2013
   
2012
   
2013
   
2012
 
Numerator:
                       
Net income (loss) attributable to Sterling common stockholders
  $ (189 )   $ 990     $ (21,792 )   $ (3,223 )
Revaluation of the  of noncontrolling interest obligations reflected in retained earnings or additional paid in capital, net of tax
    (766 )     (762 )     (1,100 )     (1,239 )
    $ (955 )   $ 228     $ (22,892 )   $ (4,462 )
Denominator:
                               
Weighted average common shares outstanding — basic
    16,652       16,405       16,626       16,362  
Shares for dilutive stock options and warrants 
    -       99       -       -  
Weighted average common shares outstanding and assumed conversions— diluted 
    16,652       16,504       16,626       16,362  
Basic net income (loss) per share attributable to Sterling common stockholders
  $ (0.06 )   $ 0.01     $ (1.38 )   $ (0.27 )
Diluted net income (loss) per share attributable to Sterling common stockholders
  $ (0.06 )   $ 0.01     $ (1.38 )   $ (0.27 )