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Note 9 - Notes and Mortgages Payable (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 29, 2020
Mar. 31, 2022
Feb. 28, 2022
Long-term Line of Credit, Total   $ 0  
February 2022 Senior Unsecured Notes [Member]      
Debt Instrument, Face Amount     $ 600,000
Debt Instrument, Interest Rate, Stated Percentage     3.20%
Senior Unsecured Notes [Member]      
Debt Instrument, Face Amount     $ 500,000
Debt Instrument, Interest Rate, Stated Percentage     3.40%
Debt Instrument, Redemption, Prepayment Charges   6,500  
Write off of Deferred Debt Issuance Cost   700  
Mortgage Relating to An Operating Property [Member]      
Proceeds from Issuance of Long-term Debt, Total   19,000  
Mortgage Debt Encumbered Operating Property [Member]      
Repayments of Long-term Debt, Total   85,900  
Liabilities, Fair Value Adjustment   $ 200  
Number of Real Estate Properties   4  
Revolving Credit Facility [Member]      
Line of Credit Facility, Current Borrowing Capacity $ 2,000,000    
Debt Instrument, Interest Rate, Effective Percentage   1.22%  
Line of Credit Facility, Maximum Borrowing Capacity $ 2,750,000    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.765%    
Letter of Credit [Member]      
Long-term Line of Credit, Total   $ 1,900