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Major Tenants (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Major Tenants

Tenants
     
2019
 
2018
             
Best Buy Stores, L.P.
   
$
204,421
$
156,662
Dollar Tree Stores, Inc.
     
137,084
 
137,084
Zale Delaware Inc.
     
99,784
 
98,024
Fresenius Medical Care of Illinois
     
97,889
 
0
Dick’s Sporting Goods, Inc.
     
0
 
232,950
Apple Indiana II LLC
     
0
 
103,184
Aggregate rental income of major tenants
   
$
539,178
$
727,904
Aggregate rental income of major tenants
as a percentage of total rental income
     
75%
 
76%