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Note 5 - Derivative Financial Instruments (Detail) (USD $)
 3 Months Ended 15 Months Ended 28 Months Ended
Mar. 31, 2013
Mar. 31, 2013
l
Aug. 31, 2015
gal
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent (in Dollars) $ 51,000    
Unrealized Gain on Price Risk Cash Flow Derivatives, before Tax (in Dollars) 18,000    
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (in Dollars)   $ 26,000  
Derivative, Nonmonetary Notional Amount, Gallons (in Liters)   965,000 1,200,000
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per US Gallon)     2.75
Derivative, Nonmonetary Notional Amount, Gallons   965,000 1,200,000
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per Item)     2.75
Minimum [Member]
      
Derivative, Nonmonetary, Number of Gallons Range   10,000  
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per US Gallon) 2.79 2.79  
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per Item) 2.79 2.79  
Maximum [Member]
      
Derivative, Nonmonetary, Number of Gallons Range   20,000  
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per US Gallon) 3.24 3.24  
Derivative, Nonmonetary Notional Amount, Price Per Gallon (in Dollars per Item) 3.24 3.24