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Note 9 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
December 31,
2018
   
December 31,
2017
 
                 
Carrying amount (excluding unamortized debt issuance costs)
  $
925,613
    $
855,116
 
Estimated fair value
  $
927,561
    $
839,753
 
Schedule of Derivative Instruments [Table Text Block]
Notional Amount
 
Related
Property Loans
Maturity Date
 
Strike Rate
   
Estimated Fair
Value at
December 31,
2018
   
Estimated Fair
Value at
December 31,
2017
 
 
$410,000
 
Tribeca House
December 15, 2018
   
2.0%
   
 
    $
148
 
 
$73,700
 
107 Columbia Heights
May 9, 2020
   
3.0%
    $
24
     
34
 
 
$75,000
 
250 Livingston Street
December 15, 2020
   
4.0%
     
     
 
Total fair value of derivative instruments included in prepaid expenses and other assets
    $
24
    $
182