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Note 16 - Customers (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Concentration Risk, Customer 10%    
Concentration Risk, Percentage 15.00%    [1]    [1]
Receivables, Long-term Contracts or Programs $ 70,815 $ 74,875  
NTTA [Member]
      
Receivables, Long-term Contracts or Programs 8,800    
UDOT [Member]
      
Receivables, Long-term Contracts or Programs   8,800 10,100
TxDOT [Member] | Accounts Receivable [Member]
      
Concentration Risk, Percentage     10.00%
TxDOT [Member]
      
Receivables, Long-term Contracts or Programs     10,800
Utah Transit Authority [Member]
      
Receivables, Long-term Contracts or Programs   $ 9,600  
Less Than [Member]
      
Concentration Risk, Percentage 10.00%    
Accounts Receivable [Member]
      
Concentration Risk, Percentage 10.00% 10.00%  
[1] Represents less than 10% of revenues