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Note 8 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
June 30,
2019
   
December 31,
2018
 
   
(unaudited)
   
 
 
 
Carrying amount (excluding unamortized debt issuance costs)
  $
974,197
    $
925,613
 
Estimated fair value
  $
1,019,601
    $
927,561
 
Schedule of Derivative Instruments [Table Text Block]
Notional Amount
 
Related
Property Loan
Maturity Date
 
Strike Rate
   
Estimated Fair
Value at
June 30,
2019
   
Estimated Fair
Value at
December 31,
2018
 
                     
(unaudited)
         
$
73,700
 
107 Columbia Heights
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