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Note 1 - Summary of Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Property, Plant, and Equipment Useful Lives [Table Text Block]
Buildings (in years)
     
39
Construction equipment (in years)
  5 -
15
Land improvements (in years)
  5 -
15
Office furniture and fixtures (in years)
  3 -
10
Transportation equipment (in years)
     
5
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
   
Years Ended December 31,
 
   
2012
   
2011
   
2010
 
Numerator:
                 
Net income (loss) attributable to Sterling common stockholders
  $ (297 )   $ (35,900 )   $ 19,087  
Revaluation of noncontrolling interest put/call liability reflected in additional paid in capital or retained earnings, net of tax
    (3,992 )     (824 )     (449 )
    $ (4,289 )   $ (36,724 )   $ 18,638  
Denominator:
                       
Weighted average common shares outstanding — basic
    16,421       16,396       16,195  
Shares for dilutive stock options and warrants 
    --       --       368  
Weighted average common shares outstanding and assumed conversions— diluted 
    16,421       16,396       16,563  
Basic net income (loss) per share attributable to Sterling common stockholders
  $ (0.26 )   $ (2.24 )   $ 1.15  
Diluted net income (loss) per share attributable to Sterling common stockholders
  $ (0.26 )   $ (2.24 )   $ 1.13