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Note 7 - Rental Income Under Operating Leases (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block]
2019 (Remainder)
  $
11,008
 
2020
   
23,901
 
2021
   
19,636
 
2022
   
19,361
 
2023
   
17,579
 
Thereafter
   
35,766
 
Total
  $
127,251