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Note 9 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
December 31,
2019
   
December 31,
2018
 
                 
Carrying amount (excluding unamortized debt issuance costs)
  $
1,009,431
    $
925,613
 
Estimated fair value
  $
1,058,083
    $
927,561
 
Schedule of Derivative Instruments [Table Text Block]
Notional Amount
 
Related
Property Loan
Maturity Date
 
Strike Rate
   
Estimated Fair
Value at
December 31,
2019
   
Estimated Fair
Value at
December 31, 2018
 
$73,700  
Clover House
May 9, 2020
   
3.0%
    $
    $
24
 
$75,000  
250 Livingston Street
December 15, 2020
   
4.0%
     
     
 
Total fair value of derivative instruments included in prepaid expenses and other assets
    $
    $
24