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Note 7 - Debt (Detail) (USD $)
Dec. 31, 2012
Nov. 30, 2012
Dec. 31, 2011
Line of Credit Facility, Maximum Borrowing Capacity $ 95,000,000 $ 85,000,000  
Debt Instrument, Fee Amount 300,000    
Letters of Credit Outstanding, Amount 39,600,000   38,900,000
Line of Credit Facility, Remaining Borrowing Capacity 52,700,000    
Line of Credit Facility, Interest Rate at Period End 5.00%    
Debt, Secured with a Cross Default Feature $ 126,500,000    
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%