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Note 8 - Notes, Mortgages and Construction Loan Payable (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 01, 2020
Feb. 29, 2020
Aug. 31, 2018
Mar. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Long-term Line of Credit, Total       $ 675.0    
Construction Loans [Member]            
Debt Instrument, Commitment     $ 67.0      
Mortgage Debt Encumbered Operating Property [Member]            
Repayments of Long-term Debt, Total       8.8    
Liabilities, Fair Value Adjustment       (0.1)    
Term Loan [Member] | Subsequent Event [Member]            
Debt Instrument, Face Amount $ 375.0       $ 590.0  
Debt Instrument, Covenant, Additional Amount Through an Accordion Feature $ 750.0          
London Interbank Offered Rate (LIBOR) [Member] | Construction Loans [Member]            
Debt Instrument, Basis Spread on Variable Rate     1.80%      
London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] | Subsequent Event [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.40%          
Base Rate [Member] | Term Loan [Member] | Subsequent Event [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.40%          
Revolving Credit Facility [Member]            
Line of Credit Facility, Current Borrowing Capacity   $ 2,000.0       $ 2,250.0
Debt Instrument, Interest Rate, Effective Percentage   1.76%        
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,750.0        
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate   0.775%        
Letter of Credit [Member]            
Long-term Line of Credit, Total       $ 0.3