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Note 3 - Construction Joint Ventures (Tables)
 6 Months Ended
Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]  
Condensed Balance Sheet [Table Text Block]
    June 30,
2015		   December 31,
2014
Total combined:                
Current assets   $ 22,517     $ 18,132  
Less current liabilities     (58,058 )     (49,035 )
Net assets   $ (35,541 )   $ (30,903 )
Backlog   $ 41,428     $ 55,063  
                 
Sterling’s noncontrolling interest in backlog   $ 12,750     $ 15,889  
Sterling’s receivables from and equity in construction joint ventures   $ 10,837     $ 9,153  
Condensed Income Statement [Table Text Block]
    Three Months Ended
June 30,		   Six Months Ended
June 30,
    2015   2014   2015   2014
Total combined:                                
Revenues   $ 27,986     $ 17,988     $ 40,992     $ 37,225  
Income before tax     2,664       1,565       5,077       2,125  
                                 
Sterling’s noncontrolling interest:                                
Revenues   $ 11,997     $ 6,694     $ 16,549     $ 15,624  
Income before tax     1,329       872       1,664       1,432