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Note 5 - Derivative Financial Instruments (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
gal
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent   $ 69,000
Unrealized Gain on Price Risk Cash Flow Derivatives, before Tax   198,000
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 41,000 44,000
Derivative, Nonmonetary Notional Amount, Gallons (in US Gallons)   620,000
Cash Flow Hedge Derivative Instrument Assets at Fair Value 30,200 30,200
Derivative Liability, Fair Value, Net $ 30,200 $ 30,200
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) 2.80 2.80
Maximum [Member]
    
Derivative, Nonmonetary, Number of Gallons Range (in US Gallons)   30,000
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per US Gallons) 3.33 3.33