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Note 9 - Derivative Financial Instruments (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
gal
Dec. 31, 2012
Dec. 31, 2011
Note 9 - Derivative Financial Instruments (Details) [Line Items]      
Other Comprehensive Income (Loss), Tax $ 0 $ 2,800  
Unrealized Gain on Price Risk Cash Flow Derivatives, before Tax 117,000 8,000  
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 48,000 $ 66,000 $ 111,000
Derivative, Nonmonetary Notional Amount, Gallons (in US Gallons) 1,100,000    
Minimum [Member]
      
Note 9 - Derivative Financial Instruments (Details) [Line Items]      
Derivative, Nonmonetary, Number of Gallons Range (in US Gallons) 10,000    
Underlying, Derivative Volume (in Dollars per US Gallon) 2.75    
Maximum [Member]
      
Note 9 - Derivative Financial Instruments (Details) [Line Items]      
Derivative, Nonmonetary, Number of Gallons Range (in US Gallons) 50,000    
Underlying, Derivative Volume (in Dollars per US Gallon) 2.93