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Note 7 - Construction Joint Ventures (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Condensed Balance Sheet [Table Text Block]
    September 30,
2016		   December 31,
2015
Total combined:                
Current assets   $ 26,893     $ 17,312  
Less current liabilities     (51,181 )     (49,371 )
Net assets   $ (24,288 )   $ (32,059 )
Backlog   $ 125,850     $ 35,113  
                 
Sterling’s noncontrolling interest in backlog   $ 60,947     $ 11,748  
Sterling’s receivables from and equity in construction joint ventures   $ 9,469     $ 12,930  
Condensed Income Statement [Table Text Block]
    Three Months Ended
September 30,		   Nine Months Ended
September 30,
    2016   2015   2016   2015
Total combined:                                
Revenues   $ 15,520     $ 9,458     $ 44,074     $ 50,450  
Income before tax     1,925       808       3,838       5,866  
                                 
Sterling’s portion of noncontrolling interest:                                
Revenues   $ 6,103     $ 3,437     $ 17,567     $ 19,986  
Income before tax     519       357       1,370       2,021