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Note 8 - Rental Income Under Operating Leases (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block]
2020
  $
23,498
 
2021
   
29,573
 
2022
   
29,286
 
2023
   
27,488
 
2024
   
26,797
 
Thereafter
   
24,697
 
Total
  $
161,339