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Major Tenants (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Major Tenants
Tenants
     
2021
 
2020
             
Best Buy Stores, L.P.
 
 
$
240,427
$
240,427
Dollar Tree Stores, Inc.
   
 
128,262
 
137,084
Zale Delaware Inc.
 
 
 
108,584
 
108,584
Fresenius Medical Care of Illinois
   
 
102,844
 
100,336
Aggregate rental income of major tenants
 
 
$
580,117
$
586,431
Aggregate rental income of major tenants
as a percentage of total rental income
 
 
 
88%
 
88%