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Note 16 - Concentration of Risk and Enterprise Wide Disclosures
 12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Segment Reporting Disclosure [Text Block]
16. Concentration of Risk and Enterprise Wide Disclosures
The following table shows contract revenues generated from the Company’s customers that accounted for more than 10% of revenues (amounts in thousands):
    Years Ended December 31,
    2015   2014   2013
    Amount   %   Amount   %   Amount   %
Texas Department of Transportation (“TXDOT”)   $ 84,129       13.5 %   $ *       * %   $ *       * %
California Department of Transportation (“Caltrans”)     96,470       15.5       97,637       14.5       92,159       16.6  
 
*Represents less than 10% of revenues
At December 31, 2015, there were no customers who owed the Company greater than 10% of contract receivables. At December 31, 2014, Foursquare Properties Inc. owed $8.5 million and TXDOT owed $7.6 million to the Company, which were amounts greater than 10% of contract receivables.
The Company’s revenue and receivables are entirely derived from the construction of U.S. projects and all of the Company’s assets are held domestically within the U.S.
A portion of our labor force is subject to collective bargaining agreements. Refer to Note 15 for further information regarding this concentration of risk.