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Note 16 - Customers (Detail) - Summary of contract revenues generated from the Company's customers: (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amount (in Dollars) $ 94,171    [1]    [1]
% 15.00%    [1]    [1]
TxDOT [Member]
      
Amount (in Dollars)    [1] 75,818 95,198
%    [1] 15.10% 20.70%
UDOT [Member]
      
Amount (in Dollars) $ 100,658 $ 144,398 $ 120,492
% 16.00% 28.80% 26.20%
[1] Represents less than 10% of revenues