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Note 8 - Mortgages and Other Financing Receivables (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Mortgages Receivable [Table Text Block]
Date
Paid
  
Amount
Received
    
Interest Rate
    
Maturity Date
Sep-18
   $
1.8
      
7.570
 %  
Jun-19
Apr-18 (1)
   $
4.5
      
7.000
 %  
May-18