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Note 11 - Mortgages and Other Financing Receivables (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mortgage Loans on Real Estate $ 70,704,000 $ 102,972,000 $ 108,493,000 $ 131,332,000
Asset Impairment Charges 59,569,000 32,763,000 39,121,000  
Impaired Financing Receivable, Recorded Investment     1,400,000  
Loans Receivable [Member]
       
Asset Impairment Charges     700,000  
In Default [Member]
       
Mortgage Loans on Real Estate, Number of Loans 4      
Mortgage Loans on Real Estate $ 19,900,000      
Minimum [Member]
       
Nonperformance Dates 7 years      
Maximum [Member]
       
Nonperformance Dates 7 years