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Note 10 - Derivative Financial Instruments (Detail) - Derivative Positions
12 Months Ended
Nov. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
Canadian Dollar/USD [Member]
CAD
Dec. 31, 2012
Interest Rate Swap [Member]
CAD
Canadian Dollar/USD     14,890,000  
Canadian Dollar/USD     109 days  
Canadian Dollar/USD     1.00  
Interest Rate Swap $ 83,000,000 $ 83,000,000   74,700,000
Interest Rate Swap       1 year 328 days