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Note 10 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
December 31, 2019
 
   
Carrying Amount
   
Fair Value
 
Mortgage notes payable
  $
1,473,166
    $
1,461,943
 
Total
  $
1,473,166
    $
1,461,943