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Note 16 - Customers (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
 
Years Ended December 31,
 
 
2012
    2011     2010  
 
Amount
   
%
   
Amount
   
%
   
Amount
   
%
 
Texas Department of Transportation (“TxDOT”)
  $ *       * %   $ 75,818       15.1 %   $ 95,198       20.7 %
Utah Department of Transportation (“UDOT”)
    100,658       16.0       144,398       28.8       120,492       26.2  
California Department of Transportation (“Caltrans”)
    94,171       15.0       *       *       *       *