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Note 18 - Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Quarterly Financial Information [Table Text Block]
    2015 Quarters Ended (unaudited)    
    March 31   June 30   September 30   December 31   Total
Revenues   $ 117,682     $ 177,425     $ 176,000     $ 152,488     $ 623,595  
Gross profit     (6,836 )     9,111       14,458       12,220       28,953  
(Loss) income before income taxes and earnings attributable to noncontrolling interests     (16,697 )     (967 )     1,326       (841 )     (17,179 )
Net (loss) income attributable to Sterling common stockholders     (16,992 )     (2,542 )     256       (1,124 )     (20,402 )
Net (loss) income per share attributable to Sterling common stockholders:                                        
Basic   $ (0.90 )   $ (0.13 )   $ 0.01     $ (1.01 )   $ (2.02 )
Diluted     (0.90 )     (0.13 )     0.01       (1.01 )     (2.02 )
    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 )