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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.
 
 
$
129,395
$
129,395
St. Vincent Health System
 
 
 
126,169
 
121,288
Talecris Plasma Resources, Inc.
   
 
168,527
 
92,968
Advance Stores Company
 
 
 
81,861
 
81,861
Aggregate rental income of major tenants
 
 
$
505,952
$
425,512
Aggregate rental income of major tenants
as a percentage of total rental income
 
 
 
99%
 
85%