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Note 7 - Debt (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Aug. 31, 2010
Line of Credit Facility, Maximum Borrowing Capacity $ 85.0  
Line of Credit Facility, Maximum Amount Outstanding During Period 50.0  
Debt Instrument, Fee Amount   0.6
Line of Credit Facility, Amount Outstanding 2.6  
Letters of Credit Outstanding, Amount 42.4  
Line of Credit Facility, Remaining Borrowing Capacity 34.3  
Debt, Secured with a Cross Default Feature 116.2  
Federal Funds Rate [Member] | Base Rate Loans [Member]
    
Debt Instrument, Basis Spread on Variable Rate 0.50%  
LIBOR [Member] | Base Rate Loans [Member]
    
Debt Instrument, Basis Spread on Variable Rate 1.00%  
Swing Line Sub Facility [Member]
    
Line of Credit Facility, Maximum Borrowing Capacity 10.0  
Percentage of Aggregate Commitments Allowed On Swing Line Sub Facility 10.00%  
Minimum [Member] | Applicable Margin [Member]
    
Debt Instrument, Basis Spread on Variable Rate 1.25%  
Minimum [Member] | LIBOR Loans [Member]
    
Debt Instrument, Basis Spread on Variable Rate 2.25%  
Minimum [Member]
    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%  
Maximum [Member] | Applicable Margin [Member]
    
Debt Instrument, Basis Spread on Variable Rate 2.25%  
Maximum [Member] | LIBOR Loans [Member]
    
Debt Instrument, Basis Spread on Variable Rate 3.25%  
Maximum [Member]
    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.75%  
Base Rate Loans [Member]
    
Line of Credit Facility, Amount Outstanding 0.6  
Line of Credit Facility, Interest Rate at Period End 5.00%  
LIBOR Loans [Member]
    
Line of Credit Facility, Amount Outstanding 2.0  
Line of Credit Facility, Interest Rate at Period End 3.00%  
Fifth Amendment [Member]
    
Debt Instrument, Fee Amount 0.3  
Availability Block [Member]
    
Line of Credit Facility, Maximum Borrowing Capacity $ 15.0