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Note 17 - Customers (Tables)
12 Months Ended
Dec. 31, 2013
Segment Reporting [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
      Years Ended December 31,  
   
2013
   
2012
   
2011
 
   
Amount
   
%
   
Amount
   
%
   
Amount
   
%
 
Texas Department of Transportation (“TxDOT”)
  $ *       * %   $ *       * %   $ 75,818       15.1 %
Utah Department of Transportation (“UDOT”)
    *       *       100,658       16.0       144,398       28.8  
California Department of Transportation (“Caltrans”)
    92,159       16.6       94,171       15.0       *       *