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Note 8 - Derivative Financial Instruments (Detail) - Summary of the Company’s Derivative Positions
3 Months Ended
Nov. 30, 2011
USD ($)
Mar. 31, 2013
Canadian Dollar/USD [Member]
CAD
Mar. 31, 2013
Interest Rate Swap [Member]
USD ($)
Canadian Dollar/USD (in Dollars)   13,410,000  
Canadian Dollar/USD   255 days  
Canadian Dollar/USD   1.0  
Interest Rate Swap (in Dollars) $ 83,000,000   $ 70,550,000
Interest Rate Swap     1 year 255 days