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Note 15 - Net Loss Per Share Attributable to Sterling Common Stockholders (Tables)
12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Years Ended December 31,
 
   
2014
   
2013
   
2012
 
Numerator:
                 
Net loss attributable to Sterling common stockholders
  $ (9,781 )   $ (73,929 )   $ (297 )
Revaluation of noncontrolling interest put/call liability reflected in additional paid in capital or retained earnings, net of tax
    -       (7,686 )     (3,992 )
    $ (9,781 )   $ (81,615 )   $ (4,289 )
Denominator:
                       
Weighted average common shares outstanding — basic
    18,063       16,635       16,421  
Shares for dilutive stock options and warrants
    -       -       -  
Weighted average common shares outstanding and assumed
conversions— diluted
    18,063       16,635       16,421  
Basic and diluted net loss per share attributable to Sterling common stockholders
  $ (0.54 )   $ (4.91 )   $ (0.26 )