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Note 9 - Derivative Financial Instruments (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
gal
Dec. 31, 2010
Other Comprehensive Income (Loss), Tax $ 2,800 $ 78,000  
Unrealized Gain on Price Risk Cash Flow Derivatives, before Tax 8,000 223,000  
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 66,000 $ 111,000 $ 0
Derivative, Nonmonetary Notional Amount, Gallons (in US Gallons)   1,200,000  
Minimum [Member]
      
Derivative, Nonmonetary, Number of Gallons Range (in US Gallons) 10,000    
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per US Gallons) 2.79    
Maximum [Member]
      
Derivative, Nonmonetary, Number of Gallons Range (in US Gallons) 20,000    
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per US Gallons) 3.29