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Major Tenants (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Major Tenants

Tenants
      
2017
  
2016
             
Dick’s Sporting Goods, Inc.
    
$
232,950
$
232,950
Best Buy Stores, L.P.
      
149,334
  
149,334
Dollar Tree Stores, Inc.
      
137,084
  
122,576
Apple Indiana II LLC
      
103,184
  
0
Zale Delaware Inc.
      
98,024
  
0
Aggregate rental income of major tenants
    
$
720,576
$
504,860
Aggregate rental income of major tenants
as a percentage of total rental income
      
76%
  
48%