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Note 20 - Quarterly Financial Information (Tables)
12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
   
2014 Quarters Ended (unaudited)
       
   
March 31
   
June 30
   
September 30
   
December 31
   
Total
 
Revenues
  $ 134,538     $ 194,806     $ 189,275     $ 153,611     $ 672,230  
Gross profit
    7,869       12,499       8,356       3,697       32,421  
Income (loss) before income taxes and earnings attributable to noncontrolling interests
    480       2,473       (1,671 )     (5,875 )     (4,593 )
Net income (loss) attributable to Sterling common stockholders
    205       1,200       (3,935 )     (7,251 )     (9,781 )
Net income (loss) per share attributable to Sterling common stockholders:
                                       
Basic
  $ 0.01     $ 0.07     $ (0.21 )   $ (0.39 )   $ (0.54 )
Diluted
    0.01       0.07       (0.21 )     (0.39 )     (0.54 )
   
2013 Quarters Ended (unaudited)
       
   
March 31
   
June 30
   
September 30
   
December 31
   
Total
 
Revenues
  $ 111,035     $ 133,350     $ 185,935     $ 125,916     $ 556,236  
Gross profit (loss)
    1,385       (16,635 )     8,359       (23,053 )     (29,944 )
Income (loss) before income taxes and earnings attributable to noncontrolling interests
    (7,219 )     (25,967 )     1,715       (37,333 )     (68,804 )
Net loss attributable to Sterling common stockholders
    (4,580 )     (17,025 )     (189 )     (52,135 )     (73,929 )
Net loss per share attributable to Sterling common stockholders:
                                       
Basic
  $ (0.39 )   $ (0.93 )   $ (0.06 )   $ (3.52 )   $ (4.91 )
Diluted
    (0.39 )     (0.93 )     (0.06 )     (3.52 )     (4.91 )