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Note 5 - Derivative Financial Instruments (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
gal
Unrealized Gain on Price Risk Cash Flow Derivatives, before Tax   $ 49,000
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent   17,000
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 13,000 $ 57,000
Derivative, Nonmonetary Notional Amount, Gallons (in US Gallons)   980,000
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 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) 3.31 3.31