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Note 10 - Notes and Mortgage Payable (Details Textual) - USD ($)
3 Months Ended
Feb. 28, 2023
Mar. 31, 2023
Feb. 29, 2020
Long-Term Line of Credit   $ 0  
Nonrecourse Mortages Assumed Through Consolidation [Member]      
Noncash or Part Noncash Acquisition, Debt Assumed   $ 37.2  
Number of Real Estate Properties   2  
Revolving Credit Facility [Member]      
Line of Credit Facility, Current Borrowing Capacity $ 2,000,000,000.0   $ 2,000,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity $ 2,750,000,000    
Debt Instrument, Basis Spread on Variable Rate 0.775%    
Debt Instrument, Interest Rate, Increase (Decrease) (0.02%)    
Debt Instrument, Interest Rate, Effective Percentage   5.66%  
Line of Credit [Member]      
Long-Term Line of Credit   $ 0